Content:

Pages

Contact Information:

4/25/2007 0:00

Statement to Certificate Holders

Analyst:

Sang Huynh

714.259.6213

Statement to Certificate Holders (Factors)

sang.huynh@abnamro.com

Pool/Non-Pool Funds Cash Reconciliation

3/26/2007 0:00

Administrator:

Hans Gehrke

312.992.4855

Cash Reconciliation Summary

5-6

hans.gehrke@abnamro.com

Pool Detail and Performance Indicators

7-9

LaSalle Website:

www.etrustee.net

Bond Interest Reconciliation Part I

5/25/2007 0:00

Bond Interest Reconciliation Part II

Bond Principal Reconciliation

Outside Parties To The Transaction

Rating Information

4/24/2007

End of Month Balance Reporting

15 Month Loan Status Summary Part I

15-23

15 Month Loan Status Summary Part II

24-32

15 Month Historical Payoff Summary

33-36

Prepayment Summary

Mortgage Loan Characteristics Part I

Mortgage Loan Characteristics Part II

39-41

2/28/2007

Geographic Concentration

Historical Realized Loss Summary

43-45

Current Period Realized Loss Detail

3/26/2007 0:00

Realized Loss Summary

Material Breaches Detail

Modified Loan Detail

Substitution Detail History

2/25/2037 0:00

Substitution Detail History Summary

4/13/2007 0:00

Delinq Method:

OTS

Determination

Date:

13-Apr-07

First Pay. Date:

Underwriter: Bear Stearns & Co. Inc.

26-Mar-07

Rated Final

Payment Date:

25-Feb-37

Master Servicer: EMC Mortgage Corporation

Closing Date:

28-Feb-07

Rating Agency: Fitch Ratings/Moody's Investors Service, Inc./Standard & Poor's

Record Date:

24-Apr-07

Distribution

Count:

Depositor: Bear Stearns Asset Backed Securities, Inc.

Prior Payment:

26-Mar-07

Next Payment:

25-May-07

ABN AMRO Acct : 724521.1

Payment Date:

25-Apr-07

Distribution Date: 25-Apr-07

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

23-Apr-2007 11:19

I-A-1

073855AA6

111,917,000.00

107,986,682.86

1,775,304.99

0.00

106,211,377.87

484,140.29

0.00

5.3800000000%

I-A-2

073855AB4

44,830,000.00

0.00

44,830,000.00

203,602.92

0.00

5.4500000000%

I-A-3

073855AC2

33,919,000.00

0.00

33,919,000.00

155,179.42

0.00

5.4900000000%

I-A-4

073855AD0

27,232,000.00

0.00

27,232,000.00

126,174.93

0.00

5.5600000000%

II-A

073855AG3

70,635,000.00

70,324,500.53

428,350.07

0.00

69,896,150.46

336,971.57

0.00

5.7500000000%

M-1

073855AE8

14,861,000.00

0.00

14,861,000.00

69,475.18

0.00

5.6100000000%

M-2

073855AF5

14,282,000.00

0.00

14,282,000.00

67,125.40

0.00

5.6400000000%

M-3

073855AH1

8,685,000.00

0.00

8,685,000.00

41,036.62

0.00

5.6700000000%

M-4

073855AJ7

7,333,000.00

0.00

7,333,000.00

35,870.59

0.00

5.8700000000%

M-5

073855AK4

6,948,000.00

0.00

6,948,000.00

34,276.80

0.00

5.9200000000%

M-6

073855AL2

6,755,000.00

0.00

6,755,000.00

33,887.58

0.00

6.0200000000%

M-7

073855AM0

6,562,000.00

0.00

6,562,000.00

40,028.20

0.00

7.3200000000%

M-8

073855AN8

5,983,000.00

0.00

5,983,000.00

36,496.30

0.00

7.3200000000%

M-9

073855AP3

4,825,000.00

0.00

4,825,000.00

29,432.50

0.00

7.3200000000%

M-10

073855AQ1

4,246,000.00

0.00

4,246,000.00

25,900.60

0.00

7.3200000000%

073855AW8

385,997,874.77 N

381,756,089.89

0.00

379,552,434.83

759,514.43

53,728.58

N/A

073855AV0

100.00

0.00

100.00

15,660.46

N/A

R-1

073855AR9

0.00

N/A

R-2

073855AS7

0.00

N/A

R-3

073855AT5

0.00

N/A

073855AU2

0.00

N/A

Total

369,013,100.00

364,772,283.40

2,203,655.06

0.00

362,568,628.34

2,494,773.79

69,389.04

Total P&I Payment

4,698,428.85

Interest Payment

(2)

Interest

Adjustment

Pass-Through

Rate

(1)

N denotes notional balance not included in total

(2)

Accrued Interest plus/minus Interest Adjustment minus Deferred Interest equals Interest Payment

Principal Payment

Principal

Adjustment or

Loss

Deferred

Interest

Ending Certificate

Balance

Class

CUSIP

Original Face

Value

(1)

Beginning

Certificate

Balance

Distribution Date: 25-Apr-07

BOND PAYMENTS

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 2 of 51

23-Apr-2007 11:18

I-A-1

073855AA6

111,917,000.00

964.881857666

15.862692799

0.000000000

949.019164867

4.325886952

0.000000000

5.38000000%

I-A-2

073855AB4

44,830,000.00

1000.000000000

0.000000000

1000.000000000

4.541666741

0.000000000

5.45000000%

I-A-3

073855AC2

33,919,000.00

1000.000000000

0.000000000

1000.000000000

4.574999853

0.000000000

5.49000000%

I-A-4

073855AD0

27,232,000.00

1000.000000000

0.000000000

1000.000000000

4.633333211

0.000000000

5.56000000%

II-A

073855AG3

70,635,000.00

995.604169808

6.064275076

0.000000000

989.539894732

4.770603384

0.000000000

N/A

M-1

073855AE8

14,861,000.00

1000.000000000

0.000000000

1000.000000000

4.675000336

0.000000000

5.61000000%

M-2

073855AF5

14,282,000.00

1000.000000000

0.000000000

1000.000000000

4.700000000

0.000000000

5.64000000%

M-3

073855AH1

8,685,000.00

1000.000000000

0.000000000

1000.000000000

4.724999424

0.000000000

5.67000000%

M-4

073855AJ7

7,333,000.00

1000.000000000

0.000000000

1000.000000000

4.891666439

0.000000000

5.87000000%

M-5

073855AK4

6,948,000.00

1000.000000000

0.000000000

1000.000000000

4.933333333

0.000000000

5.92000000%

M-6

073855AL2

6,755,000.00

1000.000000000

0.000000000

1000.000000000

5.016666173

0.000000000

6.02000000%

M-7

073855AM0

6,562,000.00

1000.000000000

0.000000000

1000.000000000

6.100000000

0.000000000

7.32000000%

M-8

073855AN8

5,983,000.00

1000.000000000

0.000000000

1000.000000000

6.100000000

0.000000000

7.32000000%

M-9

073855AP3

4,825,000.00

1000.000000000

0.000000000

1000.000000000

6.100000000

0.000000000

7.32000000%

M-10

073855AQ1

4,246,000.00

1000.000000000

0.000000000

1000.000000000

6.100000000

0.000000000

7.32000000%

073855AW8

385,997,874.77 N

989.010859496

0.000000000

983.301877131

1.967664797

0.139193979

N/A

073855AV0

100.00

1000.000000000

0.000000000

1000.000000000

156604.600000000

N/A

R-1

073855AR9

0.00

0.000000000

N/A

R-2

073855AS7

0.00

0.000000000

N/A

R-3

073855AT5

0.00

0.000000000

N/A

073855AU2

0.00

0.000000000

N/A

Interest Adjustment*

Next Rate **

* Per $1,000 of Original Face Value ** Estimated

BOND PAYMENTS

Class

CUSIP

Original Face

Value

Beginning Certificate

Balance *

Principal Payment

Principal

Adjustment or

Loss

Deferred Interest *

Ending Certificate

Balance *

Interest Payment *

Distribution Date: 25-Apr-07

Statement to Certificate Holders (FACTORS)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 3 of 51

23-Apr-2007 11:18

Interest Summary

Principal Summary

Reserve Fund

Interest Summary

Principal Summary

Beginning Balance

5,000.00

Scheduled Interest

2,588,267.53

Scheduled Prin Distribution

136,307.96

Withdrawal from Trust

0.00

Fees

162,883.51

Curtailments

950.51

Reimbursement from Waterfall

0.00

Remittance Interest

2,425,384.02

Prepayments in Full

2,066,396.59

Ending Balance

5,000.00

Other Interest Proceeds/Shortfalls

Liquidation Proceeds

0.00

Prepayment Penalties

15,660.46

Repurchase Proceeds

0.00

Swap Agreement

Other Interest Loss

0.00

Other Principal Proceeds

0.00

Other Interest Proceeds

0.00

Remittance Principal

2,203,655.06

Net Swap payment payable to the Swap

Non-advancing Interest

(1,397.67)

Administrator

55,127.01

Net PPIS/Relief Act Shortfall

0.00

Net Swap payment payable to the Swap Provider

0.00

Modification Shortfall

0.00

Other Interest Proceeds/Shortfalls

14,262.79

Swap Termination payment payable to the Swap

Interest Adjusted

2,439,646.81

Administrator

0.00

Fee Summary

Swap Termination payment payable to the Swap

0.00

Total Servicing Fees

159,065.34

Provider

Total Trustee Fees

3,818.17

LPMI Fees

0.00

Credit Manager's Fees

0.00

Misc. Fees / Trust Expense

0.00

Insurance Premium

0.00

Total Fees

162,883.51

Advances (Principal & Interest)

Prior Month's Outstanding Advances

2,261,269.57

Current Advances

N/A

Reimbursement of Prior Advances

N/A

Outstanding Advances

2,601,445.99

P&I Due Certificate Holders

4,698,428.88

Pool Source of Funds

Non-Pool Source of Funds

P&I Advances as of the end of the Due Period do not reflect the amount of advances remitted by the Servicer on the Servicer Remittance Date due to additional proceeds received between the end of the Due Period and the Servicer Remittance Date and netted from the P&I Advances
stated as of the end of the Due Period.

Distribution Date: 25-Apr-07

Cash Reconciliation Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 4 of 51

23-Apr-2007 11:18

Fixed 1st Lien

Fixed 2nd Lien

ARM 228

ARM 327

Total

Interest Summary

Scheduled Interest

676,049.36

87,145.29

822,325.56

366,946.41

1,952,466.62

Fees

44,927.23

4,161.87

49,851.37

23,757.01

122,697.48

Remittance Interest

631,122.13

82,983.42

772,474.19

343,189.40

1,829,769.14

Other Interest Proceeds/Shortfalls

Prepayment Penalties

0.00

12,074.55

3,585.91

15,660.46

Other Interest Loss

0.00

Other Interest Proceeds

0.00

Non-advancing Interest

0.00

(810.38)

0.00

(810.38)

Net PPIS/Relief Act Shortfall

0.00

Modification Shortfall

0.00

Other Interest Proceeds/Shortfalls

0.00

(810.38)

12,074.55

3,585.91

14,850.08

Interest Adjusted

631,122.13

82,173.04

784,548.74

346,775.31

1,844,619.22

Principal Summary

Scheduled Principal Distribution

50,423.14

4,016.10

22,291.31

7,757.78

84,488.33

Curtailments

8,972.46

(1,044.72)

2,791.37

(2,415.84)

8,303.27

Prepayments in Full

254,742.80

0.00

1,335,900.43

91,870.16

1,682,513.39

Liquidation Proceeds

0.00

Repurchase Proceeds

0.00

Other Principal Proceeds

0.00

Less Mod Losses

0.00

Remittance Principal

314,138.40

2,971.38

1,360,983.11

97,212.10

1,775,304.99

Fee Summary

Total Servicing Fees

43,874.14

4,064.27

48,682.90

23,200.18

119,821.49

Total Trustee Fees

1,053.09

97.60

1,168.47

556.83

2,875.99

LPMI Fees

0.00

Misc. Fees

0.00

Total Fees

44,927.23

4,161.87

49,851.37

23,757.01

122,697.48

Beginning Principal Balance

105,297,733.88

9,754,280.26

116,838,609.41

55,680,416.64

287,571,040.19

Ending Principal Balance

104,983,595.48

9,751,308.88

115,477,626.30

55,583,204.54

285,795,735.20

Advances (Principal & Interest)

Prior Month's Outstanding Advances

597,222.89

72,567.63

715,036.55

321,318.11

1,706,145.18

Current Advances

N/A

Reimbursement of Prior Advances

N/A

Outstanding Advances

653,808.01

87,668.72

866,839.94

376,445.44

1,984,762.11

Distribution Date: 25-Apr-07

Cash Reconciliation Summary Group I

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 5 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Fixed 1st Lien

Fixed 2nd Lien

Total

Interest Summary

Scheduled Interest

599,316.42

36,484.49

635,800.91

Fees

38,409.08

1,776.95

40,186.03

Remittance Interest

560,907.34

34,707.54

595,614.88

Other Interest Proceeds/Shortfalls

Prepayment Penalties

0.00

Other Interest Loss

0.00

Other Interest Proceeds

0.00

Non-advancing Interest

0.00

(587.29)

Net PPIS/Relief Act Shortfall

0.00

Modification Shortfall

0.00

Other Interest Proceeds/Shortfalls

0.00

(587.29)

Interest Adjusted

560,907.34

34,120.25

595,027.59

Principal Summary

Scheduled Principal Distribution

50,070.96

1,748.67

51,819.63

Curtailments

(8,042.26)

689.50

(7,352.76)

Prepayments in Full

383,883.20

0.00

383,883.20

Liquidation Proceeds

0.00

Repurchase Proceeds

0.00

Other Principal Proceeds

0.00

Less Mod Losses

0.00

Remittance Principal

425,911.90

2,438.17

428,350.07

Fee Summary

Total Servicing Fees

37,508.55

1,735.30

39,243.85

Total Trustee Fees

900.53

41.65

942.18

LPMI Fees

0.00

Misc. Fees

0.00

Total Fees

38,409.08

1,776.95

40,186.03

Beginning Principal Balance

90,020,445.21

4,164,604.49

94,185,049.70

Ending Principal Balance

89,594,533.31

4,162,166.32

93,756,699.63

Advances (Principal & Interest)

Prior Month's Outstanding Advances

522,792.20

32,332.19

555,124.39

Current Advances

N/A

Reimbursement of Prior Advances

N/A

Outstanding Advances

582,987.19

33,696.69

616,683.88

Cash Reconciliation Summary Group II

Page 6 of 51

23-Apr-2007 11:18

Pool Detail

Performance Indicators

Factors Impacting Principal Payment Rules

WA Rates/Life

Historical

Amount

Count

Delinquency Levels

Num

Den

Fixed

Adj

Overall

Cut-off Pool Balance

385,997,874.77

2,035

3 mo. Rolling Average

6,475,510

383,876,982

1.70%

WAC - Remit Current

7.51%

7.76%

7.62%

Cum Scheduled Principal

272,442.58

6 mo. Rolling Average

6,475,510

383,876,982

1.70%

WAC - Remit Original

7.51%

7.77%

7.63%

Cum Unscheduled Principal

6,172,997.36

12 mo. Rolling Average

6,475,510

383,876,982

1.70%

WAC - Current

8.02%

8.27%

8.14%

Cum Liquidations

0.00

Loss Levels

Amount

Count

WAC - Original

8.03%

8.28%

8.14%

Cum Repurchases

0.00

3 mo. Cum Loss

0.00

WAL - Current

341.05

355.81

347.70

6 mo. Cum loss

0.00

WAL - Original

342.16

356.81

348.78

Current

Amount

Count

12 mo. Cum Loss

0.00

Beginning Pool

381,756,089.89

2,019

98.90%

Current Index Rate

Scheduled Principal

136,307.96

0.04%

Triggers

Next Index Rate

Unscheduled Principal

2,067,347.10

0.54%

Liquidations

0.00

0.00%

> Delinquency Trigger Event

(2)

Repurchases

0.00

0.00%

Delinquency Event Calc

(1)

12,883,106.59

381,756,090

3.37%

Ending Pool

379,552,434.83

2,012

98.33%

> Loss Trigger Event?

(3)

Average Loan Balance

188,644.35

Cumulative Loss

0.00%

Current Loss Detail

Amount

> Overall Trigger Event?

Liquidation

0.00

Pool Composition

Realized Loss

0.00

Step Down Date

Realized Loss Adjustment

0.00

Distribution Count

Properties

%/Score

Net Liquidation

0.00

Current Specified Enhancement %

(4)

25.68%

Cut-off LTV

87.66%

Step Down %

(5)

50.50%

Cash Out/Refinance

44.39%

Credit Enhancement

Amount

% of Current Specified Enhancement %

(6)

31.65%

SFR

68.84%

Original OC

16,984,874.77

4.40%

> Step Down Date?

Target OC

16,983,906.49

4.40%

Min

Max

W A

Beginning OC

16,983,906.49

Extra Principal

0.00

FICO

501

807

648.34

OC Amount per PSA

16,983,906.49

4.40%

Cumulative Extra Principal

0.00

Ending OC

16,983,906.49

OC Release

N/A

Mezz Certificates

80,480,000.00 20.85%

Legend: (1) 60 Days+, REO, BK, F/C % (3) Condn: Cum Loss > specified thresholds (5) Defined Benchmark (7) Condn: Distn Cnt > 36, (4) > (5)
(2) (1) > (6) * (4), then TRUE (4) Mezzanine Certs + OC Amount / Ending Pool Bal (6) Defined Benchmark (Used in Delinq Event Calc)
Note: Delinquency and Loss Event Triggers may be flagged as "Yes" prior to the Step Down Date on account of the percentage thresholds being breached.

Owner Occupied

372,450,579.25

97.52%

Balance

334,799,800.95

169,535,925.61

262,906,250.44

Misc/Additional Information

Pool Level Information

5.320000%

Distribution Date: 25-Apr-07

Pool Detail and Performance Indicators Total (All Loans)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 7 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Pool Detail

Performance Indicators

Factors Impacting Principal Payment Rules

WA Rates/Life

Historical

Amount

Count

Delinquency Levels

Num

Den

Fixed

Adj

Overall

Cut-off Pool Balance

291,502,254.71

1,287

3 mo. Rolling Average

5,257,183

289,536,647

1.83%

WAC - Remit Current

7.45%

7.76%

7.64%

Cum Scheduled Principal

169,243.52

6 mo. Rolling Average

5,257,183

289,536,647

1.83%

WAC - Remit Original

7.46%

7.77%

7.65%

Cum Unscheduled Principal

5,537,275.99

12 mo. Rolling Average

5,257,183

289,536,647

1.83%

WAC - Current

7.96%

8.27%

8.15%

Cum Liquidations

0.00

Loss Levels

Amount

Count

WAC - Original

7.97%

8.28%

8.16%

Cum Repurchases

0.00

3 mo. Cum Loss

0.00

WAL - Current

338.97

355.81

349.05

6 mo. Cum loss

0.00

WAL - Original

340.08

356.81

350.12

Current

Amount

Count

12 mo. Cum Loss

0.00

Beginning Pool

287,571,040.19

1,272

98.65%

Current Index Rate

Scheduled Principal

84,488.33

0.03%

Triggers

Next Index Rate

Unscheduled Principal

1,690,816.66

0.58%

Liquidations

0.00

0.00%

> Delinquency Trigger Event

(2)

Repurchases

0.00

0.00%

Delinquency Event Calc

(1)

10,446,452.23

287,571,040

3.63%

Ending Pool

285,795,735.20

1,266

98.04%

> Loss Trigger Event?

(3)

Average Loan Balance

225,747.03

Cumulative Loss

0.00%

Current Loss Detail

Amount

> Overall Trigger Event?

Liquidation

0.00

Pool Composition

Realized Loss

0.00

Step Down Date

Realized Loss Adjustment

0.00

Distribution Count

Properties

%/Score

Net Liquidation

0.00

Current Specified Enhancement %

(4)

N/A

Cut-off LTV

87.89%

Step Down %

(5)

N/A

Cash Out/Refinance

36.64%

Credit Enhancement

Amount

% of Current Specified Enhancement %

(6)

N/A

SFR

66.98%

Original OC

N/A

> Step Down Date?

Target OC

N/A

Min

Max

W A

Beginning OC

N/A

Extra Principal

0.00

FICO

501

802

654.76

OC Amount per PSA

N/A

Cumulative Extra Principal

0.00

Ending OC

N/A

OC Release

N/A

Mezz Certificates

N/A

97.35%

105,391,395.68

192,694,446.06

Owner Occupied

280,034,722.18

N/A

Balance

252,834,119.25

Pool Detail and Performance Indicators Group I

Misc/Additional Information

Pool Level Information

Page 8 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Pool Detail

Performance Indicators

Factors Impacting Principal Payment Rules

WA Rates/Life

Historical

Amount

Count

Delinquency Levels

Num

Den

Fixed

Adj

Overall

Cut-off Pool Balance

94,495,620.06

748

3 mo. Rolling Average

1,218,327

94,340,335

1.29%

WAC - Remit Current

7.59%

N/A

7.59%

Cum Scheduled Principal

103,199.06

6 mo. Rolling Average

1,218,327

94,340,335

1.29%

WAC - Remit Original

7.59%

N/A

7.59%

Cum Unscheduled Principal

635,721.37

12 mo. Rolling Average

1,218,327

94,340,335

1.29%

WAC - Current

8.10%

N/A

8.10%

Cum Liquidations

0.00

Loss Levels

Amount

Count

WAC - Original

8.10%

N/A

8.10%

Cum Repurchases

0.00

3 mo. Cum Loss

0.00

WAL - Current

343.60

N/A

343.60

6 mo. Cum loss

0.00

WAL - Original

344.69

N/A

344.69

Current

Amount

Count

12 mo. Cum Loss

0.00

Beginning Pool

94,185,049.70

747

99.67%

Current Index Rate

Scheduled Principal

51,819.63

0.05%

Triggers

Next Index Rate

Unscheduled Principal

376,530.44

0.40%

Liquidations

0.00

0.00%

> Delinquency Trigger Event

(2)

Repurchases

0.00

0.00%

Delinquency Event Calc

(1)

2,436,654.36

94,185,050

2.59%

Ending Pool

93,756,699.63

746

99.22%

> Loss Trigger Event?

(3)

Average Loan Balance

125,679.22

Cumulative Loss

0.00%

Current Loss Detail

Amount

> Overall Trigger Event?

Liquidation

0.00

Pool Composition

Realized Loss

0.00

Step Down Date

Realized Loss Adjustment

0.00

Distribution Count

Properties

%/Score

Net Liquidation

0.00

Current Specified Enhancement %

(4)

N/A

Cut-off LTV

86.96%

Step Down %

(5)

N/A

Cash Out/Refinance

68.05%

Credit Enhancement

Amount

% of Current Specified Enhancement %

(6)

N/A

SFR

74.49%

Original OC

N/A

> Step Down Date?

Target OC

N/A

Min

Max

W A

Beginning OC

N/A

Extra Principal

0.00

FICO

508

807

628.77

OC Amount per PSA

N/A

Cumulative Extra Principal

0.00

Ending OC

N/A

OC Release

N/A

Mezz Certificates

N/A

Owner Occupied

92,415,857.07

98.05%

Balance

81,965,681.70

64,144,529.93

70,211,804.38

Misc/Additional Information

Pool Level Information

N/A

Pool Detail and Performance Indicators Group II

Page 9 of 51

23-Apr-2007 11:18

I-A-1

Act/360

107,986,682.86

5.380000000%

484,140.29

0.00

484,140.29

0.00

I-A-2

Act/360

44,830,000.00

5.450000000%

203,602.92

0.00

203,602.92

0.00

I-A-3

Act/360

33,919,000.00

5.490000000%

155,179.42

0.00

155,179.42

0.00

I-A-4

Act/360

27,232,000.00

5.560000000%

126,174.93

0.00

126,174.93

0.00

II-A

30/360

70,324,500.53

5.750000000%

336,971.57

0.00

336,971.57

0.00

M-1

Act/360

14,861,000.00

5.610000000%

69,475.18

0.00

69,475.18

0.00

M-2

Act/360

14,282,000.00

5.640000000%

67,125.40

0.00

67,125.40

0.00

M-3

Act/360

8,685,000.00

5.670000000%

41,036.62

0.00

41,036.62

0.00

M-4

Act/360

7,333,000.00

5.870000000%

35,870.59

0.00

35,870.59

0.00

M-5

Act/360

6,948,000.00

5.920000000%

34,276.80

0.00

34,276.80

0.00

M-6

Act/360

6,755,000.00

6.020000000%

33,887.58

0.00

33,887.58

0.00

M-7

Act/360

6,562,000.00

7.320000000%

40,028.20

0.00

40,028.20

0.00

M-8

Act/360

5,983,000.00

7.320000000%

36,496.30

0.00

36,496.30

0.00

M-9

Act/360

4,825,000.00

7.320000000%

29,432.50

0.00

29,432.50

0.00

M-10

Act/360

4,246,000.00

7.320000000%

25,900.60

0.00

25,900.60

0.00

381,756,089.89

N/A

705,785.85

55,126.99

0.00

759,514.43

0.00

100.00

N/A

0.00

15,660.46

0.00

15,660.46

0.00

R-1

0.00

N/A

0.00

N/A

R-2

0.00

N/A

0.00

N/A

R-3

0.00

N/A

0.00

N/A

0.00

N/A

0.00

N/A

Total

364,772,283.40

2,425,384.75

70,787.45

0.00

2,494,773.79

0.00

Remaining

Basis Risk
Carry-Fwd

Shortfall

Outstanding Relief

Act / Prepayment

Interest Shortfalls

Net Cap

Rate in

Effect Y/N

(1)

Basis Risk Carry-Forward Shortfall - difference between LIBOR plus margin and the Net Rate Cap.

Distributable

Certificate

Interest

Interest Payment

Amount

Current Period

(Shortfall) /

Recovery

Remaining Int

Carry-Forward

Shortfall

- - A c c r u a l - -

- - - - - - - - O u t s t a n d i n g - - - - - - - -

Class

Method

Days

Opening Balance

Pass-Thru Rate

Accrual

Certificate

Interest

Total Interest

Additions

Total Interest

Deductions

Distribution Date: 25-Apr-07

Bond Interest Reconciliation - Part I

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 10 of 51

23-Apr-2007 11:18

I-A-1

24-Apr-07

26-Mar-07

25-Apr-07

0.00

I-A-2

24-Apr-07

26-Mar-07

25-Apr-07

0.00

I-A-3

24-Apr-07

26-Mar-07

25-Apr-07

0.00

I-A-4

24-Apr-07

26-Mar-07

25-Apr-07

0.00

II-A

30-Mar-07

1-Mar-07

1-Apr-07

0.00

M-1

24-Apr-07

26-Mar-07

25-Apr-07

0.00

M-2

24-Apr-07

26-Mar-07

25-Apr-07

0.00

M-3

24-Apr-07

26-Mar-07

25-Apr-07

0.00

M-4

24-Apr-07

26-Mar-07

25-Apr-07

0.00

M-5

24-Apr-07

26-Mar-07

25-Apr-07

0.00

M-6

24-Apr-07

26-Mar-07

25-Apr-07

0.00

M-7

24-Apr-07

26-Mar-07

25-Apr-07

0.00

M-8

24-Apr-07

26-Mar-07

25-Apr-07

0.00

M-9

24-Apr-07

26-Mar-07

25-Apr-07

0.00

M-10

24-Apr-07

26-Mar-07

25-Apr-07

0.00

30-Mar-07

1-Mar-07

1-Apr-07

0.00

55,126.99

0.00

30-Mar-07

1-Mar-07

1-Apr-07

0.00

15,660.46

0.00

R-1

30-Mar-07

1-Mar-07

1-Apr-07

0.00

R-2

30-Mar-07

1-Mar-07

1-Apr-07

0.00

R-3

30-Mar-07

1-Mar-07

1-Apr-07

0.00

30-Mar-07

1-Mar-07

1-Apr-07

0.00

Total

0.00

15,660.46

0.00

55,126.99

0.00

Current Basis Risk

Carry-Fwd

Shortfall

(1)

Other Interest Proceeds are additional interest amounts specifically allocated to the bond(s) and used in determining the bonds Distributable Interest.

(2)

Interest Carry-Forward Shortfall is unpaid interest with interest thereon.

(3)

Basis Risk Carry-Forward Shortfall - difference between LIBOR plus margin and the Net Rate Cap.

Prior Shortfall

Reimbursement

Other Interest

Proceeds

(1)

Other Interest

Losses

Current Int Carry-

Fwd Shortfall

(2)

- - - - - - - - - - - - - - - - - - - - - - - - - - - A d d i t i o n s - - - - - - - - - - - - - - - - - - - - - - - - - - - -

- - - - - - - - - - - D e d u c t i o n s - - - - - - - - - -

Class

Record Date

Prior Interest Due

Date

Current Interest

Due Date

Interest Rate

SWAP Agreement

Deposits from YM

Agreement

Prepayment

Premiums

Prior Int Carry-Fwd

Shortfall

Distribution Date: 25-Apr-07

Bond Interest Reconciliation - Part II

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 11 of 51

23-Apr-2007 11:18

I-A-1

111,917,000.00

107,986,682.86

84,488.33

1,690,816.66

0.00

106,211,377.87

25-Feb-37

N/A

I-A-2

44,830,000.00

0.00

44,830,000.00

25-Feb-37

N/A

I-A-3

33,919,000.00

0.00

33,919,000.00

25-Feb-37

N/A

I-A-4

27,232,000.00

0.00

27,232,000.00

25-Feb-37

N/A

II-A

70,635,000.00

70,324,500.53

51,819.63

376,530.44

0.00

69,896,150.46

25-Feb-37

N/A

M-1

14,861,000.00

0.00

14,861,000.00

25-Feb-37

N/A

M-2

14,282,000.00

0.00

14,282,000.00

25-Feb-37

N/A

M-3

8,685,000.00

0.00

8,685,000.00

25-Feb-37

N/A

M-4

7,333,000.00

0.00

7,333,000.00

25-Feb-37

N/A

M-5

6,948,000.00

0.00

6,948,000.00

25-Feb-37

N/A

M-6

6,755,000.00

0.00

6,755,000.00

25-Feb-37

N/A

M-7

6,562,000.00

0.00

6,562,000.00

25-Feb-37

N/A

M-8

5,983,000.00

0.00

5,983,000.00

25-Feb-37

N/A

M-9

4,825,000.00

0.00

4,825,000.00

25-Feb-37

N/A

M-10

4,246,000.00

0.00

4,246,000.00

25-Feb-37

N/A

385,997,874.77

381,756,089.89

0.00

379,552,434.83

25-Feb-37

N/A

100.00

0.00

100.00

25-Feb-37

N/A

R-1

0.00

25-Feb-37

N/A

R-2

0.00

25-Feb-37

N/A

R-3

0.00

25-Feb-37

N/A

0.00

25-Feb-37

N/A

Total

369,013,100.00

364,772,283.40

136,307.96

2,067,347.10

0.00

362,568,628.34

Rated

Final

Maturity

Original

Current

Losses

Cumulative

Losses

Interest on

Losses

Ending

Class Balance

- - - - - - - - - - - - - - - - L o s s e s - - - - - - - - - - - - - - -

- Credit Support -

Class

Original Class

Balance

Beginning Class

Balance

Scheduled Principal

Payment

Unscheduled

Principal

Payment

Extra

Principal

Payment

Prior

Loss

Reimburs.

Distribution Date: 25-Apr-07

Bond Principal Reconciliation

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 12 of 51

23-Apr-2007 11:18

Class

CUSIP

Fitch

Moody's

DBRS

S&P

I-A-1

073855AA6

Aaa

AAA

I-A-2

073855AB4

Aaa

AAA

I-A-3

073855AC2

Aaa

AAA

I-A-4

073855AD0

Aaa

AAA

II-A

073855AG3

Aaa

AAA

M-1

073855AE8

Aa1

AA+

M-2

073855AF5

Aa2

M-3

073855AH1

Aa3

AA-

M-4

073855AJ7

A+

M-5

073855AK4

M-6

073855AL2

A-

M-7

073855AM0

Baa1

BBB+

M-8

073855AN8

Baa2

BBB

M-9

073855AP3

Baa3

BBB-

M-10

073855AQ1

073855AW8

073855AV0

NR - Designates that the class was not rated by the rating agency.

(1)

Changed ratings provided on this report are based on information provided by the applicable rating agency via electronic transmission. It shall be understood that this transmission will generally have been provided to LaSalle within 30 days of the payment

date listed on this statement. Because ratings may have changed during the 30 day window, or may not be being provided by the rating agency in an electronic format and therefore not being updated on this report, LaSalle recommends that investors obtain current rating
information directly from the rating agency.

- - - - - - - - - - - - O r i g i n a l R a t i n g s - - - - - - - - - -

- - - - - - - - - - - - - - - - R a t i n g s C h a n g e / C h a n g e D a t e

(1)

- - - - - - - - - - - - - - - -

Fitch

Moody's

DBRS

S&P

Distribution Date: 25-Apr-07

Ratings Information

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 13 of 51

23-Apr-2007 11:18

Type

Count

Count (%)

Balance

Balance (%)

Arrears

Arrears (%)

REO Book Value

1918

94.9975%

357,697,323.65

94.2419%

0.00

0.0000%

0.00

2.3774%

8,972,004.59

2.3638%

0.00

0.0000%

0.00

2.1793%

12,690,499.06

3.3435%

0.00

0.0000%

0.00

90+

0.0495%

67,913.69

0.0179%

0.00

0.0000%

0.00

BKY30

0.0495%

124,693.84

0.0329%

0.00

0.0000%

0.00

PIF

0.3467%

0.00

0.0000%

0.00

0.0000%

0.00

Total (Prior Month End):

2019

100.0000%

379,552,434.00

100.0000%

0.00

0.0000%

0.00

Delinq Total (Prior Month End):

4.6558%

21,855,111.00

5.7581%

0.00

0.0000%

0.00

F/C Quick Sale

Value

Total

Distribution Date: 25-Apr-07

End of Month Balance Reporting

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 14 of 51

23-Apr-2007 11:18

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

25-Apr-07

1,918

357,697,324

8,972,005

12,690,499

67,914

124,694

26-Mar-07

1,947

364,704,298

16,983,878

67,914

25-Apr-07

95.33%

94.24%

2.39%

2.36%

2.19%

3.34%

0.05%

0.02%

0.05%

0.03%

0.00%

26-Mar-07

96.43%

95.53%

3.52%

4.45%

0.05%

0.02%

0.00%

Total (All Loans)

Delinquency Balances are Exclusive of REO, Foreclosures and Bankruptcies.

Delinq 3+ Months

Bankruptcy

Foreclosure

REO

Distribution

Date

Current

Delinq 1 Month

Delinq 2 Months

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 15 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

25-Apr-07

1,198

267,610,521

7,738,762

10,253,845

67,914

124,694

26-Mar-07

1,222

273,669,179

13,833,947

67,914

25-Apr-07

94.63%

93.64%

2.84%

2.71%

2.37%

3.59%

0.08%

0.02%

0.08%

0.04%

0.00%

26-Mar-07

96.07%

95.17%

3.85%

4.81%

0.08%

0.02%

0.00%

Group I - Total

Delinquency Balances are Exclusive of REO, Foreclosures and Bankruptcies.

Delinq 3+ Months

Bankruptcy

Foreclosure

REO

Distribution

Date

Current

Delinq 1 Month

Delinq 2 Months

Page 16 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

25-Apr-07

403

101,890,150

1,519,098

1,449,654

124,694

26-Mar-07

412

103,796,485

1,501,249

25-Apr-07

96.18%

97.05%

1.91%

1.45%

1.67%

1.38%

0.00%

0.24%

0.12%

0.00%

26-Mar-07

98.10%

98.57%

1.90%

1.43%

0.00%

Group I Loans Fixed 1st Lien

Delinquency Balances are Exclusive of REO, Foreclosures and Bankruptcies.

Delinq 3+ Months

Bankruptcy

Foreclosure

REO

Distribution

Date

Current

Delinq 1 Month

Delinq 2 Months

Page 17 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

25-Apr-07

195

9,076,236

587,285

19,874

67,914

26-Mar-07

197

9,492,716

193,650

67,914

25-Apr-07

96.06%

93.08%

2.96%

6.02%

0.49%

0.20%

0.49%

0.70%

0.00%

26-Mar-07

97.04%

97.32%

2.46%

1.99%

0.49%

0.70%

0.00%

Group I Loans Fixed 2nd Lien

Delinquency Balances are Exclusive of REO, Foreclosures and Bankruptcies.

Delinq 3+ Months

Bankruptcy

Foreclosure

REO

Distribution

Date

Current

Delinq 1 Month

Delinq 2 Months

Page 18 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

25-Apr-07

448

104,600,371

3,419,938

7,457,317

26-Mar-07

460

108,198,495

8,640,115

25-Apr-07

92.75%

90.58%

3.31%

2.96%

3.93%

6.46%

0.00%

26-Mar-07

94.46%

92.61%

5.54%

7.39%

0.00%

Group I Loans ARM 228

Delinquency Balances are Exclusive of REO, Foreclosures and Bankruptcies.

Delinq 3+ Months

Bankruptcy

Foreclosure

REO

Distribution

Date

Current

Delinq 1 Month

Delinq 2 Months

Page 19 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

25-Apr-07

152

52,043,765

2,212,439

1,327,000

26-Mar-07

153

52,181,483

3,498,933

25-Apr-07

94.41%

93.63%

3.73%

3.98%

1.86%

2.39%

0.00%

26-Mar-07

94.44%

93.72%

5.56%

6.28%

0.00%

Group I Loans ARM 327

Delinquency Balances are Exclusive of REO, Foreclosures and Bankruptcies.

Delinq 3+ Months

Bankruptcy

Foreclosure

REO

Distribution

Date

Current

Delinq 1 Month

Delinq 2 Months

Page 20 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

25-Apr-07

720

90,086,802

1,233,243

2,436,654

26-Mar-07

725

91,035,119

3,149,931

25-Apr-07

96.51%

96.09%

1.61%

1.32%

1.88%

2.60%

0.00%

26-Mar-07

97.05%

96.66%

2.95%

3.34%

0.00%

Group II - Total

Delinquency Balances are Exclusive of REO, Foreclosures and Bankruptcies.

Delinq 3+ Months

Bankruptcy

Foreclosure

REO

Distribution

Date

Current

Delinq 1 Month

Delinq 2 Months

Page 21 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

25-Apr-07

565

86,134,311

1,095,460

2,364,762

26-Mar-07

568

86,986,672

3,033,773

25-Apr-07

96.75%

96.14%

1.37%

1.22%

1.88%

2.64%

0.00%

26-Mar-07

97.09%

96.63%

2.91%

3.37%

0.00%

Group II Loans Fixed 1st

Delinquency Balances are Exclusive of REO, Foreclosures and Bankruptcies.

Delinq 3+ Months

Bankruptcy

Foreclosure

REO

Distribution

Date

Current

Delinq 1 Month

Delinq 2 Months

Page 22 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

Count

Balance

25-Apr-07

155

3,952,491

137,783

71,892

26-Mar-07

157

4,048,446

116,158

25-Apr-07

95.68%

94.96%

2.47%

3.31%

1.85%

1.73%

0.00%

26-Mar-07

96.91%

97.21%

3.09%

2.79%

0.00%

Group II Loans Fixed 2nd Lien

Delinquency Balances are Exclusive of REO, Foreclosures and Bankruptcies.

Delinq 3+ Months

Bankruptcy

Foreclosure

REO

Distribution

Date

Current

Delinq 1 Month

Delinq 2 Months

Page 23 of 51

23-Apr-2007 11:18

Balance

25-Apr-07

124,694

26-Mar-07

25-Apr-07

0.00%

0.05%

0.03%

0.00%

26-Mar-07

0.00%

61-90 Days

90 + Days

Total (All Loans)

61-90 Days

90 + Days

Current

31-60 Days

- - - - - - - - - - - I n F o r e c l o s u r e a n d D e l i n q u e n t - - - - - - - - - - - - -

- - - - - - - - - - - - - - - I n R E O a n d D e l i n q u e n t - - - - - - - - - - - - - -

- - - - - - - - - - - - - I n B a n k r u p t c y a n d D e l i n q u e n t - - - - - - - - - - - - -

Distribution

Date

Current

31-60 Days

61-90 Days

90 + Days

Current

31-60 Days

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 24 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Balance

25-Apr-07

124,694

26-Mar-07

25-Apr-07

0.00%

0.08%

0.04%

0.00%

26-Mar-07

0.00%

90 + Days

Group I - Total

90 + Days

Current

31-60 Days

61-90 Days

90 + Days

Current

31-60 Days

61-90 Days

Distribution

Date

Current

31-60 Days

61-90 Days

- - - - - - - - - - - I n F o r e c l o s u r e a n d D e l i n q u e n t - - - - - - - - - - - - -

- - - - - - - - - - - - - - - I n R E O a n d D e l i n q u e n t - - - - - - - - - - - - - -

- - - - - - - - - - - - - I n B a n k r u p t c y a n d D e l i n q u e n t - - - - - - - - - - - - -

Page 25 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Balance

25-Apr-07

124,694

26-Mar-07

25-Apr-07

0.00%

0.24%

0.12%

0.00%

26-Mar-07

0.00%

61-90 Days

90 + Days

Group I Loans Fixed 1st Lien

61-90 Days

90 + Days

Current

31-60 Days

- - - - - - - - - - - I n F o r e c l o s u r e a n d D e l i n q u e n t - - - - - - - - - - - - -

- - - - - - - - - - - - - - - I n R E O a n d D e l i n q u e n t - - - - - - - - - - - - - -

- - - - - - - - - - - - - I n B a n k r u p t c y a n d D e l i n q u e n t - - - - - - - - - - - - -

Distribution

Date

Current

31-60 Days

61-90 Days

90 + Days

Current

31-60 Days

Page 26 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Balance

25-Apr-07

26-Mar-07

25-Apr-07

0.00%

26-Mar-07

0.00%

90 + Days

Group I Loans Fixed 2nd Lien

90 + Days

Current

31-60 Days

61-90 Days

90 + Days

Current

31-60 Days

61-90 Days

Distribution

Date

Current

31-60 Days

61-90 Days

- - - - - - - - - - - I n F o r e c l o s u r e a n d D e l i n q u e n t - - - - - - - - - - - - -

- - - - - - - - - - - - - - - I n R E O a n d D e l i n q u e n t - - - - - - - - - - - - - -

- - - - - - - - - - - - - I n B a n k r u p t c y a n d D e l i n q u e n t - - - - - - - - - - - - -

Page 27 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Balance

25-Apr-07

26-Mar-07

25-Apr-07

0.00%

26-Mar-07

0.00%

61-90 Days

90 + Days

Group I Loans ARM 228

61-90 Days

90 + Days

Current

31-60 Days

- - - - - - - - - - - I n F o r e c l o s u r e a n d D e l i n q u e n t - - - - - - - - - - - - -

- - - - - - - - - - - - - - - I n R E O a n d D e l i n q u e n t - - - - - - - - - - - - - -

- - - - - - - - - - - - - I n B a n k r u p t c y a n d D e l i n q u e n t - - - - - - - - - - - - -

Distribution

Date

Current

31-60 Days

61-90 Days

90 + Days

Current

31-60 Days

Page 28 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Balance

25-Apr-07

26-Mar-07

25-Apr-07

0.00%

26-Mar-07

0.00%

90 + Days

Group I Loans ARM 327

90 + Days

Current

31-60 Days

61-90 Days

90 + Days

Current

31-60 Days

61-90 Days

Distribution

Date

Current

31-60 Days

61-90 Days

- - - - - - - - - - - I n F o r e c l o s u r e a n d D e l i n q u e n t - - - - - - - - - - - - -

- - - - - - - - - - - - - - - I n R E O a n d D e l i n q u e n t - - - - - - - - - - - - - -

- - - - - - - - - - - - - I n B a n k r u p t c y a n d D e l i n q u e n t - - - - - - - - - - - - -

Page 29 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Balance

25-Apr-07

26-Mar-07

25-Apr-07

0.00%

26-Mar-07

0.00%

61-90 Days

90 + Days

Group II - Total

61-90 Days

90 + Days

Current

31-60 Days

- - - - - - - - - - - I n F o r e c l o s u r e a n d D e l i n q u e n t - - - - - - - - - - - - -

- - - - - - - - - - - - - - - I n R E O a n d D e l i n q u e n t - - - - - - - - - - - - - -

- - - - - - - - - - - - - I n B a n k r u p t c y a n d D e l i n q u e n t - - - - - - - - - - - - -

Distribution

Date

Current

31-60 Days

61-90 Days

90 + Days

Current

31-60 Days

Page 30 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Balance

25-Apr-07

26-Mar-07

25-Apr-07

0.00%

26-Mar-07

0.00%

90 + Days

Group II Loans Fixed 1st

90 + Days

Current

31-60 Days

61-90 Days

90 + Days

Current

31-60 Days

61-90 Days

Distribution

Date

Current

31-60 Days

61-90 Days

- - - - - - - - - - - I n F o r e c l o s u r e a n d D e l i n q u e n t - - - - - - - - - - - - -

- - - - - - - - - - - - - - - I n R E O a n d D e l i n q u e n t - - - - - - - - - - - - - -

- - - - - - - - - - - - - I n B a n k r u p t c y a n d D e l i n q u e n t - - - - - - - - - - - - -

Page 31 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II (as of Cut-Off)

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Balance

25-Apr-07

26-Mar-07

25-Apr-07

0.00%

26-Mar-07

0.00%

61-90 Days

90 + Days

Group II Loans Fixed 2nd Lien

61-90 Days

90 + Days

Current

31-60 Days

- - - - - - - - - - - I n F o r e c l o s u r e a n d D e l i n q u e n t - - - - - - - - - - - - -

- - - - - - - - - - - - - - - I n R E O a n d D e l i n q u e n t - - - - - - - - - - - - - -

- - - - - - - - - - - - - I n B a n k r u p t c y a n d D e l i n q u e n t - - - - - - - - - - - - -

Distribution

Date

Current

31-60 Days

61-90 Days

90 + Days

Current

31-60 Days

Page 32 of 51

23-Apr-2007 11:18

Insurance

Substitution

Liquidation

Remaining Term

Balance

Proceeds

Amount

Life

Coupon

Remit

25-Apr-07

2,012

379,552,435

2,066,397

0.00

348

8.14%

7.62%

26-Mar-07

2,019

381,756,090

4,068,629

0.00

349

8.14%

25-Apr-07

419

104,983,595

254,743

0.00

354

7.70%

7.19%

26-Mar-07

420

105,297,734

304,324

0.00

355

7.71%

Curr Weighted Avg.

Total (All Loans)

Group I Loans Fixed 1st Lien

Distribution

Date

Ending Pool

Payoffs

Realized Losses

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 33 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Insurance

Substitution

Liquidation

Remaining Term

Balance

Proceeds

Amount

Life

Coupon

Remit

25-Apr-07

203

9,751,309

0.00

178

10.72%

10.21%

26-Mar-07

203

9,754,280

226,356

0.00

179

10.72%

25-Apr-07

483

115,477,626

1,335,900

0.00

356

8.45%

7.93%

26-Mar-07

487

116,838,609

2,416,287

0.00

357

8.46%

Curr Weighted Avg.

Group I Loans Fixed 2nd Lien

Group I Loans ARM 228

Distribution

Date

Ending Pool

Payoffs

Realized Losses

Page 34 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Insurance

Substitution

Liquidation

Remaining Term

Balance

Proceeds

Amount

Life

Coupon

Remit

25-Apr-07

161

55,583,205

91,870

0.00

356

7.91%

7.40%

26-Mar-07

162

55,680,417

882,815

0.00

357

7.92%

25-Apr-07

584

89,594,533

383,883

0.00

351

7.99%

7.48%

26-Mar-07

585

90,020,445

238,847

0.00

352

7.99%

Curr Weighted Avg.

Group I Loans ARM 327

Group II Loans Fixed 1st

Distribution

Date

Ending Pool

Payoffs

Realized Losses

Page 35 of 51

23-Apr-2007 11:18

Distribution Date: 25-Apr-07

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Insurance

Substitution

Liquidation

Remaining Term

Balance

Proceeds

Amount

Life

Coupon

Remit

25-Apr-07

162

4,162,166

0.00

176

10.51%

10.00%

26-Mar-07

162

4,164,604

0.00

177

10.51%

Curr Weighted Avg.

Group II Loans Fixed 2nd Lien

Distribution

Date

Ending Pool

Payoffs

Realized Losses

Page 36 of 51

23-Apr-2007 11:18

SMM (Single Monthly Mortality)

Total

Current Period

0.54%

3-Month Average

0.80%

6-Month Average

0.80%

12-Month Average

0.80%

Average Since Cut-Off

0.80%

CPR (Conditional Prepayment Rate)

Total

Current Period

6.31%

3-Month Average

9.18%

6-Month Average

9.18%

12-Month Average

9.18%

Average Since Cut-Off

9.18%

PSA (Public Securities Association)

Total

Current Period

105%

3-Month Average

153%

6-Month Average

153%

12-Month Average

153%

Average Since Cut-Off

153%

SMM

Single Monthly Mortality

(Partial and Full Prepayments + Repurchases + Curtailments + Liquidations + Other Prin Proceeds) / (Beginning Collateral Bal - Scheduled Prin)

CPR

Conditional Prepayment Rate

1 - (1 - SMM)^12)

PSA

Public Securities Association

100 * CPR / (0.2 * MIN(30,WAS))

WAS

Weighted Average Seasoning

(Original Term - Remaining Term) * (Current Scheduled Balance / Deal Scheduled Principal Balance)

Distribution Date: 25-Apr-07

Prepayment Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

0.00%

2.43%

4.86%

7.29%

9.71%

12.14%

14.57%

17.00%

May-06

Jun-06

Jul-06

Aug-06

Sep-06

Oct-06

Nov-06

Dec-06

Jan-07

Feb-07

Mar-07

Apr-07

0.00%

14.29%

28.57%

42.86%

57.14%

71.43%

85.71%

100.00%

May-06

Jun-06

Jul-06

Aug-06

Sep-06

Oct-06

Nov-06

Dec-06

Jan-07

Feb-07

Mar-07

Apr-07

229%

457%

686%

914%

1143%

1371%

1600%

May-06

Jun-06

Jul-06

Aug-06

Sep-06

Oct-06

Nov-06

Dec-06

Jan-07

Feb-07

Mar-07

Apr-07

Page 37 of 51

23-Apr-2007 11:18

Min

Max

Count

% of Total

Balance

% of Total

Min

Max

Count

% of Total

Balance

% of Total

9,000

29,000

202

10.04%

3,748,683

0.99%

9,000

29,000

203

9.98%

3,770,094

0.98%

29,000

50,000

4.92%

3,907,227

1.03%

29,000

50,000

4.82%

3,861,272

1.00%

50,000

71,000

167

8.30%

10,280,301

2.71%

50,000

71,000

169

8.30%

10,410,611

2.70%

71,000

92,000

213

10.59%

17,321,516

4.56%

71,000

92,000

213

10.47%

17,341,782

4.49%

92,000

113,000

175

8.70%

18,005,212

4.74%

92,000

113,000

176

8.65%

18,118,493

4.69%

113,000

133,000

150

7.46%

18,409,257

4.85%

113,000

134,000

159

7.81%

19,597,959

5.08%

133,000

192,000

308

15.31%

48,607,989

12.81%

134,000

193,000

310

15.23%

49,235,237

12.76%

192,000

251,000

189

9.39%

41,624,024

10.97%

193,000

252,000

192

9.43%

42,477,397

11.00%

251,000

310,000

154

7.65%

43,072,416

11.35%

252,000

311,000

155

7.62%

43,448,869

11.26%

310,000

369,000

4.08%

27,921,549

7.36%

311,000

370,000

4.03%

27,990,003

7.25%

369,000

430,000

3.58%

28,874,986

7.61%

370,000

431,000

3.64%

29,649,773

7.68%

430,000

1,000,000

201

9.99%

117,779,276

31.03%

431,000

1,000,000

204

10.02%

120,096,385

31.11%

2,012

100.00%

379,552,435

100.00%

2,035

100.00%

385,997,875

100.00%

Min

Max

Count

% of Total

Balance

% of Total

Min

Max

Count

% of Total

Balance

% of Total

5.25%

6.94%

198

9.84%

68,140,456

17.95%

5.25%

6.94%

198

9.73%

68,222,166

17.67%

6.94%

7.30%

141

7.01%

41,543,016

10.95%

6.94%

7.31%

156

7.67%

44,654,016

11.57%

7.30%

7.66%

168

8.35%

43,122,261

11.36%

7.31%

7.69%

156

7.67%

40,823,118

10.58%

7.66%

8.02%

176

8.75%

46,058,836

12.14%

7.69%

8.06%

183

8.99%

48,090,711

12.46%

8.02%

8.38%

106

5.27%

23,929,221

6.30%

8.06%

8.44%

119

5.85%

26,036,585

6.75%

8.38%

8.81%

218

10.83%

44,114,103

11.62%

8.44%

8.85%

220

10.81%

46,179,133

11.96%

8.81%

9.20%

288

14.31%

36,877,632

9.72%

8.85%

9.23%

277

13.61%

34,705,520

8.99%

9.20%

9.59%

175

8.70%

27,302,097

7.19%

9.23%

9.61%

200

9.83%

31,855,703

8.25%

9.59%

9.98%

178

8.85%

22,463,030

5.92%

9.61%

9.98%

157

7.71%

18,845,306

4.88%

9.98%

10.38%

4.92%

11,422,559

3.01%

9.98%

10.36%

4.86%

11,586,389

3.00%

10.38%

10.80%

3.03%

5,069,367

1.34%

10.36%

10.80%

3.10%

5,253,723

1.36%

10.80%

11.75%

204

10.14%

9,509,858

2.51%

10.80%

11.75%

207

10.17%

9,745,505

2.52%

2,012

100.00%

379,552,435

100.00%

2,035

100.00%

385,997,875

100.00%

Distribution by Current Ending Principal Balance

Distribution by Cut-off Principal Balance

Distribution by Current Mortgage Rate

Distribution by Original Mortgage Rate

Distribution Date: 25-Apr-07

Mortgage Loan Characteristics Part I

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 38 of 51

23-Apr-2007 11:19

1,003

194,578,129

51.27%

352.77

7.83%

1,008

195,982,796

50.77%

357.35

7.84%

644

171,060,831

45.07%

355.81

8.27%

659

175,857,983

45.56%

360.00

8.28%

365

13,913,475

3.67%

177.20

10.66%

368

14,157,096

3.67%

181.80

10.66%

2,012

379,552,435

100.00%

2,035

385,997,875

100.00%

1,441

261,526,785

68.90%

348.19

8.14%

1,454

265,313,498

68.73%

352.64

8.15%

381

71,750,683

18.90%

345.21

8.01%

384

72,806,679

18.86%

349.40

8.02%

23,562,879

6.21%

347.87

8.27%

24,282,499

6.29%

352.40

8.26%

107

22,712,088

5.98%

349.80

8.33%

111

23,595,200

6.11%

354.36

8.35%

2,012

379,552,435

100.00%

2,035

385,997,875

100.00%

Total

SF Unattached Dwelling

PUD

Multifamily

Condo - High Facility

Distribution by Property Types (Cut-off)

Property Type

# of

Loans

Ending Balance

% of

Balance

WAMM

WAC

Total

Fixed 1st Lien

Adjustable

Fixed 2nd Lien

Distribution by Product Characteristics (Cut-off)

Product Type

# of

Loans

Original Principal

Balance

% of

Balance

WAMM

WAC

Total

SF Unattached Dwelling

PUD

Multifamily

Condo - High Facility

Distribution by Property Types (Current)

Property Type

# of

Loans

Ending Balance

% of

Balance

WAMM

WAC

Total

Adjustable

Fixed 2nd Lien

Distribution by Product Characteristics (Current)

Product Type

# of

Loans

Ending Balance

% of

Balance

WAMM

WAC

Fixed 1st Lien

Distribution Date: 25-Apr-07

Mortgage Loan Characteristics Part II

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 39 of 51

23-Apr-2007 11:19

Distribution Date: 25-Apr-07

Mortgage Loan Characteristics Part II

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

1,928

370,029,842

97.49%

347.85

8.11%

1,948

375,872,214

97.38%

352.25

8.11%

9,375,230

2.47%

341.96

9.24%

9,978,091

2.59%

346.98

9.26%

147,362

0.04%

355.00

9.40%

147,570

0.04%

360.00

9.40%

2,012

379,552,435

100.00%

2,035

385,997,875

100.00%

1,302

211,460,548

55.71%

346.48

8.47%

1,313

214,257,681

55.51%

350.89

8.48%

575

144,037,104

37.95%

350.25

7.71%

586

147,261,448

38.15%

354.59

7.73%

135

24,054,782

6.34%

343.21

7.73%

136

24,478,746

6.34%

348.01

7.73%

2,012

379,552,435

100.00%

2,035

385,997,875

100.00%

Distribution by Loan Purpose (Cut-off)

Loan Purpose

# of

Loans

Ending Balance

% of

Balance

WAMM

WAC

Distribution by Occupancy Type (Cut-off)

Occupancy Type

# of

Loans

Ending Balance

% of

Balance

WAMM

WAC

Distribution by Loan Purpose (Current)

Loan Purpose

# of

Loans

Ending Balance

% of

Balance

WAMM

WAC

Distribution by Occupancy Type (Current)

Occupancy Type

# of

Loans

Ending Balance

% of

Balance

WAMM

WAC

Total

Refinance/No Cash Out

Purchase

Refinance/Equity Takeout

Total

Owner Occupied - Secondary Residence

Owner Occupied - Primary Residence

Non-Owner Occupied

Page 40 of 51

23-Apr-2007 11:19

Distribution Date: 25-Apr-07

Mortgage Loan Characteristics Part II

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

2,012

379,552,435

100.00%

347.70

8.13%

2,035

385,997,875

100.00%

352.12

8.14%

Distribution by Originator Concentration > 10% (Cut-off)

Originator

# of

Loans

Ending Balance

% of

Balance

WAMM

WAC

Distribution by Originator Concentration > 10% (Current)

Originator

# of

Loans

Ending Balance

% of

Balance

WAMM

WAC

Fsmc

Page 41 of 51

23-Apr-2007 11:19

WAMM

WAC

California

385

142,392,533

37.52%

347

7.72%

Texas

484

50,109,469

13.20%

343

8.45%

Illinois

139

28,219,954

7.44%

353

8.69%

Washington

20,279,880

5.34%

351

7.78%

Colorado

13,290,726

3.50%

348

8.22%

Arizona

11,326,249

2.98%

351

8.02%

Florida

11,154,510

2.94%

353

8.17%

Missouri

8,306,265

2.19%

353

9.10%

Iowa

6,835,542

1.80%

348

8.62%

Maryland

6,725,924

1.77%

349

7.76%

Remaining

561

80,911,383

21.32%

347

8.46%

WAMM

WAC

California

389

144,777,069

37.51%

351

7.73%

Texas

486

50,920,233

13.19%

348

8.46%

Illinois

144

29,393,339

7.61%

357

8.70%

Washington

100

20,865,424

5.41%

356

7.81%

Colorado

13,533,931

3.51%

353

8.24%

Arizona

11,606,193

3.01%

353

8.05%

Florida

11,290,144

2.92%

357

8.18%

Missouri

8,328,646

2.16%

358

9.11%

Maryland

6,970,430

1.81%

354

7.75%

Iowa

6,844,340

1.77%

353

8.62%

Remaining

564

81,468,128

21.11%

352

8.46%

(1)

Based on Current Period Ending Principal Balance

Top 10 Original State Concentration

Geographic
Distribution

# of

Loans

Balance

(1)

% of

Balance

Top 10 Current State Concentration

Geographic
Distribution

# of

Loans

Balance

(1)

% of

Balance

Distribution Date: 25-Apr-07

Geographic Concentration

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Top 10 Current State Concentration

California

Washington

Illinois

Texas

Maryland

Iowa

Missouri

Florida

Arizona

Colorado

Remaining

Page 42 of 51

23-Apr-2007 11:19

Distribution Date

Beginning Scheduled

Balance

Net Liquidation

Proceeds

Realized Loss

Loan Count

Realized Loss

Adjusted

Cumulative

Realized Loss

Amount

Count

Amount

Count

Amount

Count

25-Apr-07

0.00

26-Mar-07

0.00

Total

0.00

Total (All Loans)

- - - - - - - - - - - - - - - - - C u r r e n t R e a l i z e d L o s s - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - P r e v i o u s L i q u i d a t i o n s / P a y o f f s - - - - - - - - - - - - - -

Claims on Prior

Liquidations

Recovery on Prior

Liquidations

(Claims)/Recoveries on

Prior Payoffs

Distribution Date: 25-Apr-07

Historical Realized Loss Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 43 of 51

23-Apr-2007 11:19

Distribution Date: 25-Apr-07

Historical Realized Loss Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Distribution Date

Beginning Scheduled

Balance

Net Liquidation

Proceeds

Realized Loss

Loan Count

Realized Loss

Adjusted

Cumulative

Realized Loss

Amount

Count

Amount

Count

Amount

Count

25-Apr-07

0.00

26-Mar-07

0.00

Total

0.00

Claims on Prior

Liquidations

Recovery on Prior

Liquidations

(Claims)/Recoveries on

Prior Payoffs

Group I

- - - - - - - - - - - - - - - - - C u r r e n t R e a l i z e d L o s s - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - P r e v i o u s L i q u i d a t i o n s / P a y o f f s - - - - - - - - - - - - - -

Page 44 of 51

23-Apr-2007 11:19

Distribution Date: 25-Apr-07

Historical Realized Loss Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Distribution Date

Beginning Scheduled

Balance

Net Liquidation

Proceeds

Realized Loss

Loan Count

Realized Loss

Adjusted

Cumulative

Realized Loss

Amount

Count

Amount

Count

Amount

Count

25-Apr-07

0.00

26-Mar-07

0.00

Total

0.00

Claims on Prior

Liquidations

Recovery on Prior

Liquidations

(Claims)/Recoveries on

Prior Payoffs

Group II

- - - - - - - - - - - - - - - - - C u r r e n t R e a l i z e d L o s s - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - P r e v i o u s L i q u i d a t i o n s / P a y o f f s - - - - - - - - - - - - - -

Page 45 of 51

23-Apr-2007 11:19

C
M
N
O
P

REO
Short Pay
Third Party
Write-off

R
S
T
W

1
2
3
4
5

6
7
8
9

Third Party
Charged Off/Matured
Side Note
Manual

Liq. Type Code - Legend
Charge-off
Matured
Repurchase
Note Sale
Paid in Full

Adjustment Legend
Escrow Bal/Adv
MREC
Rest'd Escrow
Replacement Res.
Suspense

Loss-Loan

Adjusted

Loss-Certs

Adjusted

Liq Type

Adj Type

Loss-Loan Non-

adjusted

Loss to Trust

Loss-Certs Non-

adjusted

Subsequent

Recov/(Exp)

Disclosure Control

Period

Original

Liquidation

Balance

Net Liquidation

Proceeds

Distribution Date: 25-Apr-07

Current Period Realized Loss Detail

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 46 of 51

23-Apr-2007 11:19

MDR (monthly Default Rate)

Total

Current Period

0.00%

3-Month Average

0.00%

6-Month Average

0.00%

12-Month Average

0.00%

Average Since Cut-Off

0.00%

CDR (Conditional Default Rate)

Total

Current Period

0.00%

3-Month Average

0.00%

6-Month Average

0.00%

12-Month Average

0.00%

Average Since Cut-Off

0.00%

SDA (Standard Default Assumption)

Total

Current Period

0.00%

3-Month Average

0.00%

6-Month Average

0.00%

12-Month Average

0.00%

Average Since Cut-Off

0.00%

MDR

Monthly Default Rate

(Beginning Principal Balance of Liquidated Loans) / (Total Beginning Principal Balance)

CDR

Conditional Default Rate

1 - (1 - MDR)^12

SDA

Standard Default Assumption

If WAS=30 then CDR/(WAS*0.02) else if 30<WAS=60 then CDR/0.6 else if 60<WAS=120 then CDR/(0.6-((WAS-60)*0.0095)) else if WAS>120 then CDR/0.03

WAS

Weighted Average Seasoning

(Original Term - Remaining Term) * (Current Scheduled Balance / Deal Scheduled Principal Balance)

Distribution Date: 25-Apr-07

Realized Loss Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

0.00%

0.86%

1.71%

2.57%

3.43%

4.29%

5.14%

6.00%

May-06

Jun-06

Jul-06

Aug-06

Sep-06

Oct-06

Nov-06

Dec-06

Jan-07

Feb-07

Mar-07

Apr-07

0.00%

7.14%

14.29%

21.43%

28.57%

35.71%

42.86%

50.00%

May-06

Jun-06

Jul-06

Aug-06

Sep-06

Oct-06

Nov-06

Dec-06

Jan-07

Feb-07

Mar-07

Apr-07

286%

571%

857%

1143%

1429%

1714%

2000%

May-06

Jun-06

Jul-06

Aug-06

Sep-06

Oct-06

Nov-06

Dec-06

Jan-07

Feb-07

Mar-07

Apr-07

Page 47 of 51

23-Apr-2007 11:19

Material breaches of pool asset representation or warranties or transaction covenants.

Material Breach Description

Disclosure

Control #

Loan Group #

Ending Principal

Balance

Material Breach

Date

Distribution Date: 25-Apr-07

Material Breaches Detail

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 48 of 51

23-Apr-2007 11:19

Modifications include any extensions or waivers to the mortgage loan terms, fees, penalties or payments during the preceding calendar month or that have become material over time.

Modification Description

Disclosure

Control #

Loan Group #

Modified Maturity

Date

Cutoff Maturity

Date

Distribution Date: 25-Apr-07

Modified Loan Detail

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 49 of 51

23-Apr-2007 11:19

Substitution Code

- - - Loans Substituted Into Pool - - -

- - - - - - - - - - Loans Substituted Out of Pool - - - - - - - - - -

Investor #

Period

Beginning Principal Balance

Investor #

Period

Beginning Principal

Balance

Adjusted for Principal

Distribution Date: 25-Apr-07

Substitution Detail History

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 50 of 51

23-Apr-2007 11:19

- - - Loans Substituted Into Pool - - -

- - - Loans Substituted Out of Pool - - -

Period

Count

Beginning Principal Balance

Count

Beginning Principal Balance

Adjusted for Principal

Difference Into vs.

Out

Distribution Date: 25-Apr-07

Substitution Detail History Summary

Bear Stearns Asset Backed Securities I Trust

Asset-Backed Certificates

Series 2007-FS1

Page 51 of 51

23-Apr-2007 11:19

Bear Stearns Asset Backed Securities I Trust 2007-FS1 10-D