Related Party Disclosures	6 Months Ended
Jun. 30, 2011
Related Party Disclosures
Related Party Transactions Disclosure [Text Block]	Note B - Transactions with Affiliated Parties The Partnership has no employees and depends on the Managing General Partner and its affiliates for the management and administration of all Partnership activities. The Partnership Agreement provides for payments to affiliates for services and for reimbursement of certain expenses incurred by affiliates on behalf of the Partnership. Affiliates of the Managing General Partner receive 5% of gross receipts from the Partnership's property as compensation for providing property management services. The Partnership paid to such affiliates approximately $229,000 and $225,000 for the six months ended June 30, 2011 and 2010, respectively, which are included in operating expenses. Affiliates of the Managing General Partner charged the Partnership for reimbursement of accountable administrative expenses amounting to approximately $46,000 and $64,000 for the six months ended June 30, 2011 and 2010, respectively, which is included in general and administrative expenses and investment property. The portion of these reimbursements included in investment property for the six months ended June 30, 2011 and 2010 are construction management services provided by an affiliate of the Managing General Partner of approximately $7,000 and $22,000, respectively. At June 30, 2011 and December 31, 2010, the Partnership owed approximately $65,000 and $35,000, respectively, for accountable administrative expenses, which are included in due to affiliates. For services relating to the administration of the Partnership and operation of the Partnership's property, the Managing General Partner is entitled to receive payment for non-accountable expenses up to a maximum of $100,000 per year based upon the number of Partnership units sold, subject to certain limitations. No such reimbursements were made during the six months ended June 30, 2011 or 2010. In addition to the amounts discussed above, as compensation for services rendered in managing the Partnership, the Managing General Partner is entitled to receive a Partnership Management Fee in conjunction with distributions of cash from operations, subject to certain limitations. There were no such fees paid during the six months ended June 30, 2011 or 2010, as there were no distributions from operations. Pursuant to the Partnership Agreement, AIMCO Properties, L.P., an affiliate of the Managing General Partner, advanced the Partnership approximately $131,000 during the six months ended June 30, 2010 to fund operations at the Partnership’s investment property. There were no such advances during the six months ended June 30, 2011. AIMCO Properties, L.P. charges interest on advances under the terms permitted by the Partnership Agreement. The advances bear interest at the prime rate plus 2% (5.25% at June 30, 2011) per annum. Interest expense was approximately $10,000 and $14,000 for the six months ended June 30, 2011 and 2010, respectively. During the six months ended June 30, 2011 and 2010, the Partnership repaid approximately $250,000 and $160,000 of advances and accrued interest. At June 30, 2011 and December 31, 2010, the total advances and accrued interest due to AIMCO Properties, L.P. were approximately $310,000 and $550,000, respectively, and were included in due to affiliates. The Partnership may receive additional advances of funds from AIMCO Properties, L.P. although AIMCO Properties, L.P. is not obligated to provide such advances. For more information on AIMCO Properties, L.P., including copies of its audited balance sheets, please see its reports filed with the Securities and Exchange Commission. Subsequent to June 30, 2011, the Partnership repaid approximately $230,000 of advances and accrued interest. Upon the sale of the Partnership’s property, NPI Equity will be entitled to an Incentive Compensation Fee equal to 3% of the difference between the sales price of the property and the appraised value for such property at February 1, 1992. Payment of the Incentive Compensation Fee is subordinated to the receipt by the limited partners, of: (a) distributions from capital transaction proceeds of an amount equal to their appraised investment in the Partnership at February 1, 1992, and (b) distributions from all sources (capital transactions as well as cash flow) of an amount equal to six percent (6%) per annum cumulative, non-compounded, on their appraised investment in the Partnership at February 1, 1992. Prior to 2010, these preferences were met. Accordingly, the Managing General Partner will be entitled to this fee upon completion of the proposed merger discussed in “Note A”. The fee, estimated to be approximately $1,298,000, did reduce the merger consideration being offered to the limited partners. The Partnership insures its property up to certain limits through coverage provided by Aimco which is generally self-insured for a portion of losses and liabilities related to workers’ compensation, property casualty, general liability and vehicle liability. The Partnership insures its property above the Aimco limits through insurance policies obtained by Aimco from insurers unaffiliated with the Managing General Partner. During the six months ended June 30, 2011, the Partnership was charged by Aimco and its affiliates approximately $54,000 for hazard insurance coverage and fees associated with policy claims administration. Additional charges will be incurred by the Partnership during 2011 as other insurance policies renew later in the year. The Partnership was charged by Aimco and its affiliates approximately $149,000 for insurance coverage and fees associated with policy claims administration during the year ended December 31, 2010.

Related Party Disclosures

6 Months Ended

Jun. 30, 2011

Note B - Transactions with Affiliated Parties

The Partnership has no employees and depends on the Managing General Partner and its affiliates for the management and administration of all Partnership activities. The Partnership Agreement provides for payments to affiliates for services and for reimbursement of certain expenses incurred by affiliates on behalf of the Partnership.

Affiliates of the Managing General Partner receive 5% of gross receipts from the Partnership's property as compensation for providing property management services. The Partnership paid to such affiliates approximately $229,000 and $225,000 for the six months ended June 30, 2011 and 2010, respectively, which are included in operating expenses.

Affiliates of the Managing General Partner charged the Partnership for reimbursement of accountable administrative expenses amounting to approximately $46,000 and $64,000 for the six months ended June 30, 2011 and 2010, respectively, which is included in general and administrative expenses and investment property. The portion of these reimbursements included in investment property for the six months ended June 30, 2011 and 2010 are construction management services provided by an affiliate of the Managing General Partner of approximately $7,000 and $22,000, respectively. At June 30, 2011 and December 31, 2010, the Partnership owed approximately $65,000 and $35,000, respectively, for accountable administrative expenses, which are included in due to affiliates.

For services relating to the administration of the Partnership and operation of the Partnership's property, the Managing General Partner is entitled to receive payment for non-accountable expenses up to a maximum of $100,000 per year based upon the number of Partnership units sold, subject to certain limitations. No such reimbursements were made during the six months ended June 30, 2011 or 2010.

In addition to the amounts discussed above, as compensation for services rendered in managing the Partnership, the Managing General Partner is entitled to receive a Partnership Management Fee in conjunction with distributions of cash from operations, subject to certain limitations. There were no such fees paid during the six months ended June 30, 2011 or 2010, as there were no distributions from operations.

Pursuant to the Partnership Agreement, AIMCO Properties, L.P., an affiliate of the Managing General Partner, advanced the Partnership approximately $131,000 during the six months ended June 30, 2010 to fund operations at the Partnership’s investment property. There were no such advances during the six months ended June 30, 2011. AIMCO Properties, L.P. charges interest on advances under the terms permitted by the Partnership Agreement. The advances bear interest at the prime rate plus 2% (5.25% at June 30, 2011) per annum. Interest expense was approximately $10,000 and $14,000 for the six months ended June 30, 2011 and 2010, respectively. During the six months ended June 30, 2011 and 2010, the Partnership repaid approximately $250,000 and $160,000 of advances and accrued interest. At June 30, 2011 and December 31, 2010, the total advances and accrued interest due to AIMCO Properties, L.P. were approximately $310,000 and $550,000, respectively, and were included in due to affiliates. The Partnership may receive additional advances of funds from AIMCO Properties, L.P. although AIMCO Properties, L.P. is not obligated to provide such advances. For more information on AIMCO Properties, L.P., including copies of its audited balance sheets, please see its reports filed with the Securities and Exchange Commission. Subsequent to June 30, 2011, the Partnership repaid approximately $230,000 of advances and accrued interest.

Upon the sale of the Partnership’s property, NPI Equity will be entitled to an Incentive Compensation Fee equal to 3% of the difference between the sales price of the property and the appraised value for such property at February 1, 1992. Payment of the Incentive Compensation Fee is subordinated to the receipt by the limited partners, of: (a) distributions from capital transaction proceeds of an amount equal to their appraised investment in the Partnership at February 1, 1992, and (b) distributions from all sources (capital transactions as well as cash flow) of an amount equal to six percent (6%) per annum cumulative, non-compounded, on their appraised investment in the Partnership at February 1, 1992. Prior to 2010, these preferences were met. Accordingly, the Managing General Partner will be entitled to this fee upon completion of the proposed merger discussed in “Note A”. The fee, estimated to be approximately $1,298,000, did reduce the merger consideration being offered to the limited partners.

The Partnership insures its property up to certain limits through coverage provided by Aimco which is generally self-insured for a portion of losses and liabilities related to workers’ compensation, property casualty, general liability and vehicle liability. The Partnership insures its property above the Aimco limits through insurance policies obtained by Aimco from insurers unaffiliated with the Managing General Partner. During the six months ended June 30, 2011, the Partnership was charged by Aimco and its affiliates approximately $54,000 for hazard insurance coverage and fees associated with policy claims administration. Additional charges will be incurred by the Partnership during 2011 as other insurance policies renew later in the year. The Partnership was charged by Aimco and its affiliates approximately $149,000 for insurance coverage and fees associated with policy claims administration during the year ended December 31, 2010.

- Definition

The entire disclosure for related party transactions, including the nature of the relationship(s), a description of the transactions, the amount of the transactions, the effects of any change in the method of establishing the terms of the transaction from the previous period, stated interest rate, expiration date, terms and manner of settlement per the agreement with the related party, and amounts due to or from related parties. If the entity and one or more other entities are under common ownership or management control and this control affects the operating results or financial position, disclosure includes the nature of the control relationship even if there are no transactions between the entities. Disclosure may also include the aggregate amount of current and deferred tax expense for each statement of earnings presented where the entity is a member of a group that files a consolidated tax return, the amount of any tax related balances due to or from affiliates as of the date of each statement of financial position presented, the principal provisions of the method by which the consolidated amount of current and deferred tax expense is allocated to the members of the group and the nature and effect of any changes in that method. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 3A
-Section 04
-Paragraph b

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 57
-Paragraph 1-4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph k

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

+ Details

NATIONAL PROPERTY INVESTORS 4 10-Q/A