ABN AMRO

LASALLE BANK

N.A.

STRUCTURED ASSET SECURITIES CORPORATION

STATEMENT DATE:

04/25/2003

MORTGAGE PASS-THROUGH CERTIFICATES

PAYMENT DATE:

04/25/2003

135 S. LASALLE STREET SUITE 1625

CHICAGO, IL 60603-4159

USA

SERIES 2003-4

PRIOR PAYMENT:

03/25/2003

NEXT PAYMENT:

05/27/2003

RECORD DATE:

03/31/2003

ABN AMRO ACCT: 67-9175-00-0

ADMINISTRATOR:

REPORTING PACKAGE TABLE OF CONTENTS

ANALYST:

CHRISTOPHER LEWIS (312) 904-7992

JAMES MACMILLAN (714) 238-6717

CHRISTOPHER.LEWIS@ABNAMRO.COM

JAMES.MACMILLAN@ABNAMRO.COM

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

PAGE(S)

ISSUE ID:

SASC0304

CLOSING DATE:

2/28/2003

STATEMENTS TO CERTIFICATEHOLDERS

PAGE 2-4

CASH RECONCILIATION SUMMARY

PAGE 5

FIRST PAYMENT DATE:

3/25/2003

MONTHLY DATA FILE NAME:

BOND INTEREST RECONCILIATION

PAGE 6

ASSUMED FINAL PAYMENT: DATE:

2/25/2033

SASC0304_200304_3.ZIP

OTHER RELATED INFORMATION

PAGE 7

ASSET-BACKED FACTS ~ 15 MONTH LOAN STATUS SUMMARY

PAGE 8

ASSET-BACKED FACTS ~ 15 MONTH PAYOFF/LOSS SUMMARY

PAGE 9

MODIFIED LOAN DETAIL

PAGE 10

HISTORICAL REO REPORT

PAGE 11

REALIZED LOSS DETAIL

PAGE 12

PARTIES TO THE TRANSACTION

ISSUER: LEHMAN BROTHERS INC.

DEPOSITOR: STRUCTURED ASSET SECURITIES CORPORATION

UNDERWRITER: LEHMAN BROTHERS INC.

MASTER SERVICER: AURORA LOAN SERVICES, INC.

RATING AGENCY: FITCH RATINGS/STANDARD & POOR'S RATING SERVICES

INFORMATION IS AVAILABLE FOR THIS ISSUE FROM THE FOLLOWING SOURCES

LASALLE WEB SITE

WWW.ETRUSTEE.NET

SERVICER WEB SITE

WWW.ALSERVICES.COM

LASALLE FACTOR LINE

(800) 246-5761

04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.

PAGE 1 OF 12

FORM 8-K

	ABN AMRO
	LASALLE BANK		N.A.
STRUCTURED ASSET SECURITIES CORPORATION
										MORTGAGE PASS-THROUGH CERTIFICATES																										STATEMENT DATE:									04/25/2003
										SERIES 2003-4																										PAYMENT DATE:						04/25/2003
WAC:						6.487955%																														PRIOR PAYMENT:							03/25/2003
																																				NEXT PAYMENT:								05/27/2003
WAMM:						349
																																				RECORD DATE:									03/31/2003
										REMIC
										ABN AMRO ACCT: 67-9175-00-0
									ORIGINAL							OPENING		PRINCIPAL			PRINCIPAL			NEGATIVE				CLOSING					INTEREST			INTEREST				PASS-THROUGH
				CLASS				FACE VALUE (1)								BALANCE		PAYMENT			ADJ. OR LOSS			AMORTIZATION				BALANCE					PAYMENT (2)			ADJUSTMENT				RATE
			CUSIP												PER $ 1000				PER $ 1000			PER $ 1000			PER $ 1000				PER $ 1000					PER $ 1000		PER $ 1000		NEXT RATE(3)
	A1						100,000,000.00					95,945,020.38					3,757,140.12			0.00			0.00				92,187,880.26				379,782.37				0.00				4.75000000%
	86359ANX7													959.450203800			37.571401200			0.000000000			0.000000000				921.878802600					3.797823700			0.000000000						FIXED
	A2						50,000,000.00					47,972,510.20					1,878,570.06			0.00			0.00				46,093,940.14				199,885.46				0.00				5.00000000%
	86359ANY5													959.450204000			37.571401200			0.000000000			0.000000000				921.878802800					3.997709200			0.000000000						FIXED
	A3						24,000,000.00					23,026,804.89					901,713.63			0.00			0.00				22,125,091.26				153,512.03				0.00				8.00000000%
	86359ANZ2													959.450203750			37.571401250			0.000000000			0.000000000				921.878802500					6.396334583			0.000000000						FIXED
	A4						50,000,000.00					47,972,510.20					1,878,570.06			0.00			0.00				46,093,940.14				229,868.28				0.00				5.75000000%
	86359APA5													959.450204000			37.571401200			0.000000000			0.000000000				921.878802800					4.597365600			0.000000000						FIXED
	A5						175,000,000.00					167,903,785.66					6,574,995.21			0.00			0.00				161,328,790.45				629,639.20				0.00				4.50000000%
	86359APB3													959.450203771			37.571401200			0.000000000			0.000000000				921.878802571					3.597938286			0.000000000						FIXED
	A6						63,719,000.00					61,135,207.54					2,394,012.11			0.00			0.00				58,741,195.43				254,730.03				0.00				5.00000000%
	86359APC1													959.450203864			37.571401152			0.000000000			0.000000000				921.878802712					3.997709161			0.000000000						FIXED
	A7						17,959,000.00					17,959,000.00					0.00			0.00			0.00				17,959,000.00				74,829.17				0.00				5.00000000%
	86359APD9													1000.000000000			0.000000000			0.000000000			0.000000000				1000.000000000					4.166666852			0.000000000						FIXED
	A8						1,000,000.00					959,450.21					37,571.40			0.00			0.00				921,878.81				6,396.33				0.00				8.00000000%
	86359AQE6													959.450210000			37.571400000			0.000000000			0.000000000				921.878810000					6.396330000			0.000000000						FIXED
	AP						179,333.00					179,108.97					224.94			0.00			0.00				178,884.03				0.00				0.00				N/A
	86359APE7													998.750759760			1.254314599			0.000000000			0.000000000				997.496445161					0.000000000			0.000000000
	AX						76,044,182.00				N	71,699,473.48					0.00			0.00			0.00				67,598,197.25				358,497.37				0.00				6.00000000%
	86359APF4													942.865997033			0.000000000			0.000000000			0.000000000				888.933189524					4.714330019			0.000000000						FIXED
	PAX						28,007,336.00				N	27,859,984.57					0.00			0.00			0.00				27,684,513.72				139,299.92				0.00				6.00000000%
	86359APG2													994.738827356			0.000000000			0.000000000			0.000000000				988.473652760					4.973694035			0.000000000						FIXED
	B1						12,015,000.00					12,005,028.11					9,936.07			0.00			0.00				11,995,092.04				50,020.95				0.00				5.00000000%
	86359APH0													999.170046608			0.826972118			0.000000000			0.000000000				998.343074490					4.163208489			0.000000000						FIXED
	B2						2,252,000.00					2,250,130.95					1,862.34			0.00			0.00				2,248,268.61				9,375.55				0.00				5.00000000%
	86359APJ6													999.170048845			0.826971581			0.000000000			0.000000000				998.343077265					4.163210480			0.000000000						FIXED
	B3						2,002,000.00					2,000,338.43					1,655.60			0.00			0.00				1,998,682.83				8,334.74				0.00				5.00000000%
	86359APK3													999.170044955			0.826973027			0.000000000			0.000000000				998.343071928					4.163206793			0.000000000						FIXED
	B4						750,000.00					749,377.54					620.23			0.00			0.00				748,757.31				3,122.41				0.00				5.00000000%
	86359APM9/U8599KBF8													999.170053333			0.826973333			0.000000000			0.000000000				998.343080000					4.163213333			0.000000000						FIXED
	B5						750,000.00					749,377.54					620.23			0.00			0.00				748,757.31				3,122.41				0.00				5.00000000%
	86359APN7/U8599KBG6													999.170053333			0.826973333			0.000000000			0.000000000				998.343080000					4.163213333			0.000000000						FIXED
	B6						1,004,848.00					1,004,014.02					830.98			0.00			0.00				1,003,183.04				4,183.39				0.00				5.00000000%
	86359APP2/U8599KBH4													999.170043628			0.826970845			0.000000000			0.000000000				998.343072783					4.163206774			0.000000000						FIXED
	R						100.00					0.00					0.00			0.00			0.00				0.00				0.00				0.00				N/A
	9ABSK411													0.000000000			0.000000000			0.000000000			0.000000000				0.000000000					0.000000000			0.000000000						FIXED
		TOTAL			500,631,281.00								481,811,664.64				17,438,322.98			0.00			0.00				464,373,341.66				2,504,599.61				0.00
																										TOTAL P&I PAYMENT				19,942,922.59
	E						0.00					0.00					0.00			0.00			0.00				0.00				0.00				0.00				0.00000000%
	9ABSK409													0.000000000			0.000000000			0.000000000			0.000000000				0.000000000					0.000000000			0.000000000						FIXED
	P						0.00					0.00					0.00			0.00			0.00				0.00				0.00				0.00				0.00000000%
	9ABSK410													0.000000000			0.000000000			0.000000000			0.000000000				0.000000000					0.000000000			0.000000000						FIXED
		TOTAL			0.00								0.00				0.00			0.00			0.00				0.00				0.00				0.00
																										TOTAL P&I PAYMENT				0.00
NOTES: (1) N DENOTES NOTIONAL BALANCE NOT INCLUDED IN TOTAL (2) ACCRUED INTEREST PLUS/MINUS INTEREST ADJUSTMENT MINUS DEFERRED INTEREST EQUALS INTEREST PAYMENT (3) ESTIMATED. * DENOTES CONTROLLING CLASS
04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.																																					PAGE 2 OF 12

CURRENT REPORT
Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

		ABN AMRO
		LASALLE BANK	N.A.
	STRUCTURED ASSET SECURITIES CORPORATION
	MORTGAGE PASS-THROUGH CERTIFICATES																														STATEMENT DATE:					04/25/2003
																																		PAYMENT DATE:								04/25/2003
					SERIES 2003-4																													PRIOR PAYMENT:								03/25/2003
																																		NEXT PAYMENT:								05/27/2003
																																		RECORD DATE:								03/31/2003
					ABN AMRO ACCT: 67-9175-00-0
CASH RECONCILIATION SUMMARY
				INTEREST SUMMARY								PRINCIPAL SUMMARY																		SERVICING FEE SUMMARY
				CURRENT SCHEDULED INTEREST		542,242.14				SCHEDULED PRINCIPAL:
				LESS DEFERRED INTEREST		0.00				CURRENT SCHEDULED PRINCIPAL							70,306.40								CURRENT SERVICING FEES									20,881.05
				LESS PPIS REDUCING SCHEDULED INT		0.00																			PLUS FEES ADVANCED FOR PPIS									0.00
										ADVANCED SCHEDULED PRINCIPAL							328,545.96								LESS REDUCTION FOR PPIS									0.00
				PLUS GROSS ADVANCE INTEREST		1,983,238.52				SCHEDULED PRINCIPAL										398,852.36
				LESS ASER INTEREST ADV REDUCTION					0.00																PLUS DELINQUENT SERVICING FEES									79,496.38
				LESS OTHER INTEREST NOT ADVANCED		0.00				UNSCHEDULED PRINCIPAL:
				LESS OTHER ADJUSTMENT		0.00				CURTAILMENTS							110,966.17									TOTAL SERVICING FEES									100,377.43
										PREPAYMENTS IN FULL							16,928,504.45
				TOTAL		2,525,480.65
				UNSCHEDULED INTEREST:						LIQUIDATION PROCEEDS							0.00
										REPURCHASE PROCEEDS							0.00
				PREPAYMENT PENALTIES		0.00
				YIELD MAINTENANCE PENALTIES		0.00				OTHER PRINCIPAL PROCEEDS							0.00
				OTHER INTEREST PROCEEDS		0.00				TOTAL UNSCHEDULED PRINCIPAL											17,039,470.62
				TOTAL		0.00				REMITTANCE PRINCIPAL							17,438,322.98
				LESS FEE PAID TO SERVICER		(20,881.05)					REMITTANCE P&I DUE TRUST								19,942,922.59
				LESS FEE STRIPS PAID BY SERVICER		0.00
											REMITTANCE P&I DUE CERTS							19,942,922.59
				LESS FEES & EXPENSES PAID BY/TO SERVICER																									PPIS SUMMARY
				SPECIAL SERVICING FEES			0.00						POOL BALANCE SUMMARY
				WORKOUT FEES		0.00										BALANCE								COUNT	GROSS PPIS									0.00
				LIQUIDATION FEES		0.00
										BEGINNING POOL				481,811,665.58									1,094		REDUCED BY PPIE									0.00
				INTEREST DUE SERV ON ADVANCES		0.00				SCHEDULED PRINCIPAL				398,852.36											REDUCED BY SHORTFALLS IN FEES									0.00
				NON RECOVERABLE ADVANCES		0.00				UNSCHEDULED PRINCIPAL				17,039,470.62								38			REDUCED BY OTHER AMOUNTS									0.00
				MISC. FEES & EXPENSES		0.00				DEFERRED INTEREST				0.00
										LIQUIDATIONS				0.00								0			PPIS REDUCING SCHEDULED INTEREST									0.00
																									PPIS REDUCING SERVICING FEE									0.00
				TOTAL UNSCHEDULED FEES & EXPENSES		0.00				REPURCHASES				0.00								0
				TOTAL INTEREST DUE TRUST		2,504,599.61				ENDING POOL					464,373,342.60							1,056				PPIS DUE CERTIFICATE									0.00
				LESS FEES & EXPENSES PAID BY/TO TRUST																								ADVANCE SUMMARY (ADVANCE MADE BY SERVICER)
																																	PRINCIPAL				INTEREST
				TRUSTEE FEE		0.00
				FEE STRIPS		0.00																					PRIOR OUTSTANDING					348,042.09									2,087,524.58
				MISC. FEES		0.00
				INTEREST RESERVE WITHHOLDING		0.00																					PLUS CURRENT PERIOD					328,545.96							1,983,238.52
				PLUS INTEREST RESERVE DEPOSIT		0.00																					LESS RECOVERED					(338,531.99)								(2,025,724.84)
				TOTAL				0.00																			LESS NON RECOVERED					0.00								0.00
																											ENDING OUTSTANDING					338,056.06						2,045,038.26
				TOTAL INTEREST DUE CERTS		2,504,599.61
		04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.																																		PAGE 5 OF 12

Date of Report (Date of earliest event reported) May 27, 2003

	ABN AMRO
	LASALLE BANK		N.A.
					STRUCTURED ASSET SECURITIES CORPORATION
																	MORTGAGE PASS-THROUGH CERTIFICATES																																																STATEMENT DATE:				04/25/2003
																																																																	PAYMENT DATE:				04/25/2003
																	SERIES 2003-4
																																																																	PRIOR PAYMENT:					03/25/2003
																																																														NEXT PAYMENT:									05/27/2003
																																																														RECORD DATE:										03/31/2003
															ABN AMRO ACCT: 67-9175-00-0
																	BOND INTEREST RECONCILIATION
																										DEDUCTIONS																		ADDITIONS
																																																															REMAINING
								ACCRUAL						PASS							ACCRUED
DEFERRED &
						PRIOR						INT ACCRUAL						PREPAY-							OTHER			DISTRIBUTABLE							INTEREST	CURRENT PERIOD					OUTSTANDING
																																																																			CREDIT SUPPORT
															THRU								CERTIFICATE								ALLOCABLE				ACCRETION				INTEREST		INT. SHORT-					ON PRIOR		MENT						INTEREST		CERTIFICATE			PAYMENT		(SHORTFALL)/			INTEREST
			CLASS			METHOD DAYS										RATE						INTEREST								PPIS				INTEREST				LOSS/EXP					FALLS DUE			SHORTFALL (3)				PENALTIES	PROCEEDS (1)
INTEREST (2)
				AMOUNT					RECOVERY				SHORTFALLS				ORIGINAL							CURRENT(4)
		A1					30/360			30	4.750000000%									379,782.37									0.00				0.00				0.00					0.00			0.00				0.00			0.00			379,782.37			379,782.37		0.00				0.00				NA					NA
		A2					30/360			30	5.000000000%									199,885.46									0.00				0.00				0.00					0.00			0.00				0.00			0.00			199,885.46			199,885.46		0.00				0.00				NA					NA
		A3					30/360			30	8.000000000%									153,512.03									0.00				0.00				0.00					0.00			0.00				0.00			0.00			153,512.03			153,512.03		0.00				0.00				NA					NA
		A4					30/360			30	5.750000000%									229,868.28									0.00				0.00				0.00					0.00			0.00				0.00			0.00			229,868.28			229,868.28		0.00				0.00				NA					NA
		A5					30/360			30	4.500000000%									629,639.20									0.00				0.00				0.00					0.00			0.00				0.00			0.00			629,639.20			629,639.20		0.00				0.00				NA					NA
		A6					30/360			30	5.000000000%									254,730.03									0.00				0.00				0.00					0.00			0.00				0.00			0.00			254,730.03			254,730.03		0.00				0.00				NA					NA
		A7					30/360			30	5.000000000%									74,829.17									0.00				0.00				0.00					0.00			0.00				0.00			0.00			74,829.17			74,829.17		0.00				0.00				NA					NA
		A8					30/360			30	8.000000000%									6,396.33									0.00				0.00				0.00					0.00			0.00				0.00			0.00			6,396.33			6,396.33		0.00				0.00				NA					NA
		AP					30/360			30	0.000000000%									0.00									0.00				0.00				0.00					0.00			0.00				0.00			0.00			0.00			0.00		0.00				0.00				NA					NA
		AX					30/360			30	6.000000000%									358,497.37									0.00				0.00				0.00					0.00			0.00				0.00			0.00			358,497.37			358,497.37		0.00				0.00				NA					NA
		PAX					30/360			30	6.000000000%									139,299.92									0.00				0.00				0.00					0.00			0.00				0.00			0.00			139,299.92			139,299.92		0.00				0.00				NA					NA
		B1					30/360			30	5.000000000%									50,020.95									0.00				0.00				0.00					0.00			0.00				0.00			0.00			50,020.95			50,020.95		0.00				0.00				NA					NA
		B2					30/360			30	5.000000000%									9,375.55									0.00				0.00				0.00					0.00			0.00				0.00			0.00			9,375.55			9,375.55		0.00				0.00				NA					NA
		B3					30/360			30	5.000000000%									8,334.74									0.00				0.00				0.00					0.00			0.00				0.00			0.00			8,334.74			8,334.74		0.00				0.00				NA					NA
		B4					30/360			30	5.000000000%									3,122.41									0.00				0.00				0.00					0.00			0.00				0.00			0.00			3,122.41			3,122.41		0.00				0.00				NA					NA
		B5					30/360			30	5.000000000%									3,122.41									0.00				0.00				0.00					0.00			0.00				0.00			0.00			3,122.41			3,122.41		0.00				0.00				NA					NA
		B6					30/360			30	5.000000000%									4,183.39									0.00				0.00				0.00					0.00			0.00				0.00			0.00			4,183.39			4,183.39		0.00				0.00				NA					NA
		E					30/360			30	0.000000000%									0.00									0.00				0.00				0.00					0.00			0.00				0.00			0.00			0.00			0.00		0.00				0.00				NA					NA
		P					30/360			30	0.000000000%									0.00									0.00				0.00				0.00					0.00			0.00				0.00			0.00			0.00			0.00		0.00				0.00				NA					NA
																			2,504,599.61								0.00					0.00					0.00			0.00					0.00		0.00						0.00		2,504,599.61		2,504,599.61			0.00				0.00
	(1) OTHER INTEREST PROCEEDS ARE ADDITIONAL INTEREST AMOUNTS SPECIFICALLY ALLOCATED TO THE BOND(S) AND USED IN DETERMINING THE BONDS DISTRIBUTABLE INTEREST.
	(2) ACCRUED - DEDUCTIONS + ADDITIONS INTEREST
	(3) INCLUDES INTEREST ACCRUED ON OUTSTANDING INTEREST SHORTFALLS AND/OR LOSS ALLOCATIONS. WHERE APPLICABLE.
	(4) DETERMINED AS FOLLOWS: (A) THE ENDING BALANCE OF ALL THE CLASSES LESS (B) THE SUM OF (I) THE ENDING BALANCE OF THE CLASS AND (II) THE ENDING BALANCE OF ALL CLASSES WHICH ARE NOT SUBORDINATE TO THE CLASS DIVIDED BY (A).
																																																																		PAGE 6 OF 12
	04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.

Structured Asset Securities Corporation (as Depositor under the Trust Agreement, dated as of February 1, 2003, providing for the issuance of Mortgage Pass-Through Certificates, Series 2003-4)
(Exact name of registrant as specified in its charter)

ABN AMRO

LASALLE BANK

N.A.

STRUCTURED ASSET SECURITIES CORPORATION

MORTGAGE PASS-THROUGH CERTIFICATES

STATEMENT DATE:

04/25/2003

SERIES 2003-4

PAYMENT DATE:

04/25/2003

PRIOR PAYMENT:

03/25/2003

NEXT PAYMENT:

05/27/2003

RECORD DATE:

03/31/2003

ABN AMRO ACCT: 67-9175-00-0

OTHER RELATED INFORMATION

SPECIAL HAZARD COVERAGE

FRAUD LOSS COVERAGE

BANKRUPTCY LOSS COVERAGE

BEGINNING

BALANCE

CURRENT

REDUCTION

ENDING

BALANCE

BEGINNING

BALANCE

CURRENT

REDUCTION

ENDING

BALANCE

BEGINNING

BALANCE

CURRENT

REDUCTION

ENDING

BALANCE

0.00

TOTAL

NUMBER OF PAYOFFS:

AGGREGATE PAYOFF AMOUNTS:

16,928,504.45

NUMBER OF CURTAILMENTS:

156

AGGREGATE CURTAILMENT AMOUNTS:

110,966.17

NUMBER OF LOANS IN FORECLOSURE:

BOOK VALUE OF LOANS IN FORECLOSURE:

0.00

PRIOR REALIZED LOSSES ALLOCATED TO THE CERTIFICATES:

0.00

CURRENT REALIZED LOSSES ALLOCATED TO THE CERTIFICATES:

0.00

CUMULATIVE REALIZED LOSSES ALLOCATED TO THE CERTIFICATES SINCE CUTOFF:

0.00

04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.

PAGE 7 OF 12

Delaware
(State or other jurisdiction
of incorporation)

333-92140
(Commission
File Number)

74-2440850
(IRS Employer
Identification No.)

		ABN AMRO
		LASALLE BANK		N.A.
		STRUCTURED ASSET SECURITIES CORPORATION
																																											STATEMENT DATE:					04/25/2003
												MORTGAGE PASS-THROUGH CERTIFICATES																															PAYMENT DATE:					04/25/2003
																																											SERIES 2003-4
												PRIOR PAYMENT:									03/25/2003
																																											NEXT PAYMENT:						05/27/2003
																																											RECORD DATE:							03/31/2003
												ABN AMRO ACCT: 67-9175-00-0
												ASSET-BACKED FACTS ~ 15 MONTH HISTORICAL LOAN STATUS SUMMARY
											DELINQUENCY AGING CATEGORIES																								SPECIAL EVENT CATEGORIES (1)
DISTRIBUTION
DATE
DELINQ 1 MONTH								DELINQ 2 MONTHS					DELINQ 3+ MONTHS					FORECLOSURE							REO				MODIFICATIONS								SPECIALLY SERVICED				BANKRUPTCY
	# BALANCE								# BALANCE					# BALANCE					# BALANCE						# BALANCE							# BALANCE						# BALANCE					# BALANCE
					04/25/2003		28		11,005,591						2	767,772				0		0			0	0				0	0		0			0			0	0					0		0
						2.65%				2.37%			0.19%				0.17%			0.00%			0.00%	0.00%			0.00%	0.00%				0.00%		0.00%			0.00%		0.00%			0.00%				0.00%					0.00%
					03/25/2003		2		760,215						0	0				0		0			0	0				0	0		0			0			0	0					0		0
						0.18%				0.16%			0.00%				0.00%			0.00%			0.00%	0.00%			0.00%	0.00%				0.00%		0.00%			0.00%		0.00%			0.00%				0.00%					0.00%
			(1) NOTE: MODIFICATION, SPECIALLY SERVICED & BANKRUPTCY TOTALS ARE INCLUDED IN THE APPROPRIATE DELINQUENCY AGING CATEGORY
				04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.																																								PAGE 8 OF 12

745 Seventh Avenue, 7th Floor, New York, New York
(Address of principal executive offices)

10019
(Zip Code)

	ABN AMRO
	LASALLE BANK		N.A.
	STRUCTURED ASSET SECURITIES CORPORATION
	MORTGAGE PASS-THROUGH CERTIFICATES																																		STATEMENT DATE:				04/25/2003
																																									PAYMENT DATE:				04/25/2003
										SERIES 2003-4																															PRIOR PAYMENT:					03/25/2003
																																									NEXT PAYMENT:						05/27/2003
																																									RECORD DATE:							03/31/2003
										ABN AMRO ACCT: 67-9175-00-0
										ASSET-BACKED FACTS ~ 15 MONTH HISTORICAL PAYOFF/LOSS SUMMARY
						ENDING POOL (1)							PAYOFFS(2)			PENALTIES				APPRAISAL REDUCT. (2)					LIQUIDATIONS (2)						REALIZED LOSSES (2)							REMAINING TERM						CURR WEIGHTED AVG.
DISTRIBUTION
DATE
		# BALANCE					# BALANCE						# AMOUNT				# BALANCE						# BALANCE					# AMOUNT								LIFE		AMORT		COUPON REMIT
				04/25/2003	1,056			464,373,343				38		16,928,504				0	0			0	0			0			0			0		0					349		350		6.49%					6.24%
									92.76%		3.47%				3.51%						0.00%			0.00%			0.00%			0.00%			0.00%				0.00%
				03/25/2003	1,094			481,811,666				40		18,157,622				1	24,000			0	0			0			0			0		0					349		351		6.50%					6.25%
									96.24%		3.53%				3.63%						0.00%			0.00%			0.00%			0.00%			0.00%				0.00%
		(1) PERCENTAGE BASED ON POOL AS OF CUTOFF. (2) PERCENTAGE BASED ON POOL AS OF BEGINNING OF PERIOD.
																																										PAGE 9 OF 12
			04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.

Registrant's telephone number, including area code 212-526-7000

ABN AMRO

LASALLE BANK

N.A.

STRUCTURED ASSET SECURITIES CORPORATION

STATEMENT DATE:

04/25/2003

MORTGAGE PASS-THROUGH CERTIFICATES

PAYMENT DATE:

04/25/2003

SERIES 2003-4

PRIOR PAYMENT:

03/25/2003

NEXT PAYMENT:

05/27/2003

RECORD DATE:

03/31/2003

ABN AMRO ACCT: 67-9175-00-0

MODIFIED LOAN DETAIL

CUTOFF

MATURITY

DATE

MODIFIED

MATURITY

DATE

DISCLOSURE

CONTROL #

MODIFICATION

DATE

MODIFICATION

DESCRIPTION

04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.

PAGE 10 OF 12

(Former name or former address, if changed since last report.)

ABN AMRO

LASALLE BANK

N.A.

STRUCTURED ASSET SECURITIES CORPORATION

MORTGAGE PASS-THROUGH CERTIFICATES

STATEMENT DATE:

04/25/2003

PAYMENT DATE:

04/25/2003

SERIES 2003-4

PRIOR PAYMENT:

03/25/2003

NEXT PAYMENT:

05/27/2003

RECORD DATE:

03/31/2003

ABN AMRO ACCT: 67-9175-00-0

HISTORICAL COLLATERAL LEVEL REO REPORT

RECENT

APPRAISAL

VALUE

APPRAISAL

REDUCTION

AMOUNT

DISCLOSURE

CONTROL #

REO

DATE

CITY

STATE

PROPERTY

TYPE

ACTUAL

BALANCE

SCHEDULED

BALANCE

DATE

LIQUIDATED

LIQUIDATION

PROCEEDS

LIQUIDATION

EXPENSES

REALIZED

LOSS

PAGE 11 OF 12

04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.

Item 5. Other Events and Regulation FD Disclosure.

ABN AMRO

LASALLE BANK

N.A.

STRUCTURED ASSET SECURITIES CORPORATION

STATEMENT DATE:

04/25/2003

MORTGAGE PASS-THROUGH CERTIFICATES

PAYMENT DATE:

04/25/2003

SERIES 2003-4

PRIOR PAYMENT:

03/25/2003

NEXT PAYMENT:

05/27/2003

RECORD DATE:

03/31/2003

ABN AMRO ACCT: 67-9175-00-0

REALIZED LOSS DETAIL

BEGINNING

SCHEDULED

BALANCE

GROSS PROCEEDS

AS A % OF

SCHED. BALANCE

AGGREGATE

LIQUIDATION

EXPENSES *

NET

LIQUIDATION

PROCEEDS

NET PROCEEDS

AS A % OF

SCHED. BALANCE

PERIOD

DISCLOSURE

CONTROL #

APPRAISAL

DATE

APPRAISAL

VALUE

GROSS

PROCEEDS

REALIZED

LOSS

CURRENT TOTAL

CUMULATIVE

* AGGREGATE LIQUIDATION EXPENSES ALSO INCLUDE OUTSTANDING P&I ADVANCES AND UNPAID SERVICING FEES, UNPAID TRUSTEE FEES, ETC..

04/23/2003 - 16:26 (K389-K411) 2003 LASALLE BANK N.A.

PAGE 12 OF 12

This current report on Form 8-K relates to the monthly distribution reported to the holders of Structured Asset Securities Corporation Mortgage Pass-Through Certificates, Series 2003-4 , which was made on May 27, 2003.

Item 7. Financial Statements and Exhibits.

99.1 Monthly distribution report pursuant to Section 4.03 of the Trust Agreement for the distribution on May 27, 2003.
(Exhibit No. Description)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LASALLE BANK NATIONAL ASSOCIATION, IN ITS CAPACITY AS TRUSTEE UNDER THE TRUST AGREEMENT ON BEHALF OF STRUCTURED ASSET SECURITIES CORPORATION, REGISTRANT

Date: May 28, 2003

By: /s/ Russell Goldenberg
Russell Goldenberg
Group Senior Vice President

Filing Compare · STRUCTURED ASSET SEC CORP MORT PASS THR CERTS SER 03 4