§ 42. Low-income housing credit

(a) In general
For purposes of section 38, the amount of the low-income housing credit determined under this section for any taxable year in the credit period shall be an amount equal to—
(1) the applicable percentage of
(2) the qualified basis of each qualified low-income building.
(b) Applicable percentage: 70 percent present value credit for certain new buildings; 30 percent present value credit for certain other buildings
(1) Determination of applicable percentage
For purposes of this section, the term “applicable percentage” means, with respect to any building, the appropriate percentage prescribed by the Secretary for the earlier of—
(i) the month in which such building is placed in service, or
(ii) at the election of the taxpayer—
(I) the month in which the taxpayer and the housing credit agency enter into an agreement with respect to such building (which is binding on such agency, the taxpayer, and all successors in interest) as to the housing credit dollar amount to be allocated to such building, or
(II) in the case of any building to which subsection (h)(4)(B) applies, the month in which the tax-exempt obligations are issued.
A month may be elected under clause (ii) only if the election is made not later than the 5th day after the close of such month. Such an election, once made, shall be irrevocable.
(B)  1 Method of prescribing percentages
The percentages prescribed by the Secretary for any month shall be percentages which will yield over a 10-year period amounts of credit under subsection (a) which have a present value equal to—
(i) 70 percent of the qualified basis of a new building which is not federally subsidized for the taxable year, and
(ii) 30 percent of the qualified basis of a building not described in clause (i).
(C) Method of discounting
The present value under subparagraph (B) shall be determined—
(i) as of the last day of the 1st year of the 10-year period referred to in subparagraph (B),
(ii) by using a discount rate equal to 72 percent of the average of the annual Federal mid-term rate and the annual Federal long-term rate applicable under section 1274 (d)(1) to the month applicable under clause (i) or (ii) of subparagraph (A) [1] and compounded annually, and
(iii) by assuming that the credit allowable under this section for any year is received on the last day of such year.
(2) Temporary minimum credit rate for non-federally subsidized new buildings
In the case of any new building—
(A) which is placed in service by the taxpayer after the date of the enactment of this paragraph and before December 31, 2013, and
(B) which is not federally subsidized for the taxable year,
the applicable percentage shall not be less than 9 percent.
(3) Cross references
(A) For treatment of certain rehabilitation expenditures as separate new buildings, see subsection (e).
(B) For determination of applicable percentage for increases in qualified basis after the 1st year of the credit period, see subsection (f)(3).
(C) For authority of housing credit agency to limit applicable percentage and qualified basis which may be taken into account under this section with respect to any building, see subsection (h)(7).
(c) Qualified basis; qualified low-income building
For purposes of this section—
(1) Qualified basis
(A) Determination
The qualified basis of any qualified low-income building for any taxable year is an amount equal to—
(i) the applicable fraction (determined as of the close of such taxable year) of
(ii) the eligible basis of such building (determined under subsection (d)(5)).
(B) Applicable fraction
For purposes of subparagraph (A), the term “applicable fraction” means the smaller of the unit fraction or the floor space fraction.
(C) Unit fraction
For purposes of subparagraph (B), the term “unit fraction” means the fraction—
(i) the numerator of which is the number of low-income units in the building, and
(ii) the denominator of which is the number of residential rental units (whether or not occupied) in such building.
(D) Floor space fraction
For purposes of subparagraph (B), the term “floor space fraction” means the fraction—
(i) the numerator of which is the total floor space of the low-income units in such building, and
(ii) the denominator of which is the total floor space of the residential rental units (whether or not occupied) in such building.
(E) Qualified basis to include portion of building used to provide supportive services for homeless
In the case of a qualified low-income building described in subsection (i)(3)(B)(iii), the qualified basis of such building for any taxable year shall be increased by the lesser of—
(i) so much of the eligible basis of such building as is used throughout the year to provide supportive services designed to assist tenants in locating and retaining permanent housing, or
(ii) 20 percent of the qualified basis of such building (determined without regard to this subparagraph).
(2) Qualified low-income building
The term “qualified low-income building” means any building—
(A) which is part of a qualified low-income housing project at all times during the period—
(i) beginning on the 1st day in the compliance period on which such building is part of such a project, and
(ii) ending on the last day of the compliance period with respect to such building, and
(B) to which the amendments made by section 201(a) of the Tax Reform Act of 1986 apply.
(d) Eligible basis
For purposes of this section—
(1) New buildings
The eligible basis of a new building is its adjusted basis as of the close of the 1st taxable year of the credit period.
(2) Existing buildings
(A) In general
The eligible basis of an existing building is—
(i) in the case of a building which meets the requirements of subparagraph (B), its adjusted basis as of the close of the 1st taxable year of the credit period, and
(ii) zero in any other case.
(B) Requirements
A building meets the requirements of this subparagraph if—
(i) the building is acquired by purchase (as defined in section 179 (d)(2)),
(ii) there is a period of at least 10 years between the date of its acquisition by the taxpayer and the date the building was last placed in service,
(iii) the building was not previously placed in service by the taxpayer or by any person who was a related person with respect to the taxpayer as of the time previously placed in service, and
(iv) except as provided in subsection (f)(5), a credit is allowable under subsection (a) by reason of subsection (e) with respect to the building.
(C) Adjusted basis
For purposes of subparagraph (A), the adjusted basis of any building shall not include so much of the basis of such building as is determined by reference to the basis of other property held at any time by the person acquiring the building.
(D) Special rules for subparagraph (B)
(i) Special rules for certain transfers For purposes of determining under subparagraph (B)(ii) when a building was last placed in service, there shall not be taken into account any placement in service—
(I) in connection with the acquisition of the building in a transaction in which the basis of the building in the hands of the person acquiring it is determined in whole or in part by reference to the adjusted basis of such building in the hands of the person from whom acquired,
(II) by a person whose basis in such building is determined under section 1014 (a) (relating to property acquired from a decedent),
(III) by any governmental unit or qualified nonprofit organization (as defined in subsection (h)(5)) if the requirements of subparagraph (B)(ii) are met with respect to the placement in service by such unit or organization and all the income from such property is exempt from Federal income taxation,
(IV) by any person who acquired such building by foreclosure (or by instrument in lieu of foreclosure) of any purchase-money security interest held by such person if the requirements of subparagraph (B)(ii) are met with respect to the placement in service by such person and such building is resold within 12 months after the date such building is placed in service by such person after such foreclosure, or
(V) of a single-family residence by any individual who owned and used such residence for no other purpose than as his principal residence.
(ii) Related person For purposes of subparagraph (B)(iii), a person (hereinafter in this subclause referred to as the “related person”) is related to any person if the related person bears a relationship to such person specified in section 267 (b) or 707 (b)(1), or the related person and such person are engaged in trades or businesses under common control (within the meaning of subsections (a) and (b) of section 52).
(3) Eligible basis reduced where disproportionate standards for units
(A) In general
Except as provided in subparagraph (B), the eligible basis of any building shall be reduced by an amount equal to the portion of the adjusted basis of the building which is attributable to residential rental units in the building which are not low-income units and which are above the average quality standard of the low-income units in the building.
(B) Exception where taxpayer elects to exclude excess costs
(i) In general Subparagraph (A) shall not apply with respect to a residential rental unit in a building which is not a low-income unit if—
(I) the excess described in clause (ii) with respect to such unit is not greater than 15 percent of the cost described in clause (ii)(II), and
(II) the taxpayer elects to exclude from the eligible basis of such building the excess described in clause (ii) with respect to such unit.
(ii) Excess The excess described in this clause with respect to any unit is the excess of—
(I) the cost of such unit, over
(II) the amount which would be the cost of such unit if the average cost per square foot of low-income units in the building were substituted for the cost per square foot of such unit.
 The Secretary may by regulation provide for the determination of the excess under this clause on a basis other than square foot costs.
(4) Special rules relating to determination of adjusted basis
For purposes of this subsection—
(A) In general
Except as provided in subparagraphs (B) and (C), the adjusted basis of any building shall be determined without regard to the adjusted basis of any property which is not residential rental property.
(B) Basis of property in common areas, etc., included
The adjusted basis of any building shall be determined by taking into account the adjusted basis of property (of a character subject to the allowance for depreciation) used in common areas or provided as comparable amenities to all residential rental units in such building.
(C) Inclusion of basis of property used to provide services for certain nontenants
(i) In general The adjusted basis of any building located in a qualified census tract (as defined in paragraph (5)(C)) shall be determined by taking into account the adjusted basis of property (of a character subject to the allowance for depreciation and not otherwise taken into account) used throughout the taxable year in providing any community service facility.
(ii) Limitation The increase in the adjusted basis of any building which is taken into account by reason of clause (i) shall not exceed the sum of—
(I) 25 percent of so much of the eligible basis of the qualified low-income housing project of which it is a part as does not exceed $15,000,000, plus
(II) 10 percent of so much of the eligible basis of such project as is not taken into account under subclause (I).
 For purposes of the preceding sentence, all community service facilities which are part of the same qualified low-income housing project shall be treated as one facility.
(iii) Community service facility For purposes of this subparagraph, the term “community service facility” means any facility designed to serve primarily individuals whose income is 60 percent or less of area median income (within the meaning of subsection (g)(1)(B)).
(D) No reduction for depreciation
The adjusted basis of any building shall be determined without regard to paragraphs (2) and (3) of section 1016 (a).
(5) Special rules for determining eligible basis
(A) Federal grants not taken into account in determining eligible basis
The eligible basis of a building shall not include any costs financed with the proceeds of a federally funded grant.
(B) Increase in credit for buildings in high cost areas
(i) In general In the case of any building located in a qualified census tract or difficult development area which is designated for purposes of this subparagraph—
(I) in the case of a new building, the eligible basis of such building shall be 130 percent of such basis determined without regard to this subparagraph, and
(II) in the case of an existing building, the rehabilitation expenditures taken into account under subsection (e) shall be 130 percent of such expenditures determined without regard to this subparagraph.
(ii) Qualified census tract
(I) In general The term “qualified census tract” means any census tract which is designated by the Secretary of Housing and Urban Development and, for the most recent year for which census data are available on household income in such tract, either in which 50 percent or more of the households have an income which is less than 60 percent of the area median gross income for such year or which has a poverty rate of at least 25 percent. If the Secretary of Housing and Urban Development determines that sufficient data for any period are not available to apply this clause on the basis of census tracts, such Secretary shall apply this clause for such period on the basis of enumeration districts.
(II) Limit on MSA’s designated The portion of a metropolitan statistical area which may be designated for purposes of this subparagraph shall not exceed an area having 20 percent of the population of such metropolitan statistical area.
(III) Determination of areas For purposes of this clause, each metropolitan statistical area shall be treated as a separate area and all nonmetropolitan areas in a State shall be treated as 1 area.
(iii) Difficult development areas
(I) In general The term “difficult development areas” means any area designated by the Secretary of Housing and Urban Development as an area which has high construction, land, and utility costs relative to area median gross income.
(II) Limit on areas designated The portions of metropolitan statistical areas which may be designated for purposes of this subparagraph shall not exceed an aggregate area having 20 percent of the population of such metropolitan statistical areas. A comparable rule shall apply to nonmetropolitan areas.
(iv) Special rules and definitions For purposes of this subparagraph—
(I) population shall be determined on the basis of the most recent decennial census for which data are available,
(II) area median gross income shall be determined in accordance with subsection (g)(4),
(III) the term “metropolitan statistical area” has the same meaning as when used in section 143 (k)(2)(B), and
(IV) the term “nonmetropolitan area” means any county (or portion thereof) which is not within a metropolitan statistical area.
(v) Buildings designated by State housing credit agency Any building which is designated by the State housing credit agency as requiring the increase in credit under this subparagraph in order for such building to be financially feasible as part of a qualified low-income housing project shall be treated for purposes of this subparagraph as located in a difficult development area which is designated for purposes of this subparagraph. The preceding sentence shall not apply to any building if paragraph (1) of subsection (h) does not apply to any portion of the eligible basis of such building by reason of paragraph (4) of such subsection.
(6) Credit allowable for certain buildings acquired during 10-year period described in paragraph (2)(B)(ii)
(A) In general
Paragraph (2)(B)(ii) shall not apply to any federally- or State-assisted building.
(B) Buildings acquired from insured depository institutions in default
On application by the taxpayer, the Secretary may waive paragraph (2)(B)(ii) with respect to any building acquired from an insured depository institution in default (as defined in section 3 of the Federal Deposit Insurance Act) or from a receiver or conservator of such an institution.
(C) Federally- or State-assisted building
For purposes of this paragraph—
(i) Federally-assisted building The term “federally-assisted building” means any building which is substantially assisted, financed, or operated under section 8 of the United States Housing Act of 1937, section 221(d)(3), 221(d)(4), or 236 of the National Housing Act, section 515 of the Housing Act of 1949, or any other housing program administered by the Department of Housing and Urban Development or by the Rural Housing Service of the Department of Agriculture.
(ii) State-assisted building The term “State-assisted building” means any building which is substantially assisted, financed, or operated under any State law similar in purposes to any of the laws referred to in clause (i).
(7) Acquisition of building before end of prior compliance period
(A) In general
Under regulations prescribed by the Secretary, in the case of a building described in subparagraph (B) (or interest therein) which is acquired by the taxpayer—
(i) paragraph (2)(B) shall not apply, but
(ii) the credit allowable by reason of subsection (a) to the taxpayer for any period after such acquisition shall be equal to the amount of credit which would have been allowable under subsection (a) for such period to the prior owner referred to in subparagraph (B) had such owner not disposed of the building.
(B) Description of building
A building is described in this subparagraph if—
(i) a credit was allowed by reason of subsection (a) to any prior owner of such building, and
(ii) the taxpayer acquired such building before the end of the compliance period for such building with respect to such prior owner (determined without regard to any disposition by such prior owner).
(e) Rehabilitation expenditures treated as separate new building
(1) In general
Rehabilitation expenditures paid or incurred by the taxpayer with respect to any building shall be treated for purposes of this section as a separate new building.
(2) Rehabilitation expenditures
For purposes of paragraph (1)—
(A) In general
The term “rehabilitation expenditures” means amounts chargeable to capital account and incurred for property (or additions or improvements to property) of a character subject to the allowance for depreciation in connection with the rehabilitation of a building.
(B) Cost of acquisition, etc,2 not included
Such term does not include the cost of acquiring any building (or interest therein) or any amount not permitted to be taken into account under paragraph (3) or (4) of subsection (d).
(3) Minimum expenditures to qualify
(A) In general
Paragraph (1) shall apply to rehabilitation expenditures with respect to any building only if—
(i) the expenditures are allocable to 1 or more low-income units or substantially benefit such units, and
(ii) the amount of such expenditures during any 24-month period meets the requirements of whichever of the following subclauses requires the greater amount of such expenditures:
(I) The requirement of this subclause is met if such amount is not less than 20 percent of the adjusted basis of the building (determined as of the 1st day of such period and without regard to paragraphs (2) and (3) of section 1016 (a)).
(II) The requirement of this subclause is met if the qualified basis attributable to such amount, when divided by the number of low-income units in the building, is $6,000 or more.
(B) Exception from 10 percent rehabilitation
In the case of a building acquired by the taxpayer from a governmental unit, at the election of the taxpayer, subparagraph (A)(ii)(I) shall not apply and the credit under this section for such rehabilitation expenditures shall be determined using the percentage applicable under subsection (b)(2)(B)(ii).
(C) Date of determination
The determination under subparagraph (A) shall be made as of the close of the 1st taxable year in the credit period with respect to such expenditures.
(D) Inflation adjustment
In the case of any expenditures which are treated under paragraph (4) as placed in service during any calendar year after 2009, the $6,000 amount in subparagraph (A)(ii)(II) shall be increased by an amount equal to—
(i) such dollar amount, multiplied by
(ii) the cost-of-living adjustment determined under section 1 (f)(3) for such calendar year by substituting “calendar year 2008” for “calendar year 1992” in subparagraph (B) thereof.
Any increase under the preceding sentence which is not a multiple of $100 shall be rounded to the nearest multiple of $100.
(4) Special rules
For purposes of applying this section with respect to expenditures which are treated as a separate building by reason of this subsection—
(A) such expenditures shall be treated as placed in service at the close of the 24-month period referred to in paragraph (3)(A), and
(B) the applicable fraction under subsection (c)(1) shall be the applicable fraction for the building (without regard to paragraph (1)) with respect to which the expenditures were incurred.
Nothing in subsection (d)(2) shall prevent a credit from being allowed by reason of this subsection.
(5) No double counting
Rehabilitation expenditures may, at the election of the taxpayer, be taken into account under this subsection or subsection (d)(2)(A)(i) but not under both such subsections.
(6) Regulations to apply subsection with respect to group of units in building
The Secretary may prescribe regulations, consistent with the purposes of this subsection, treating a group of units with respect to which rehabilitation expenditures are incurred as a separate new building.
(f) Definition and special rules relating to credit period
(1) Credit period defined
For purposes of this section, the term “credit period” means, with respect to any building, the period of 10 taxable years beginning with—
(A) the taxable year in which the building is placed in service, or
(B) at the election of the taxpayer, the succeeding taxable year,
but only if the building is a qualified low-income building as of the close of the 1st year of such period. The election under subparagraph (B), once made, shall be irrevocable.
(2) Special rule for 1st year of credit period
(A) In general
The credit allowable under subsection (a) with respect to any building for the 1st taxable year of the credit period shall be determined by substituting for the applicable fraction under subsection (c)(1) the fraction—
(i) the numerator of which is the sum of the applicable fractions determined under subsection (c)(1) as of the close of each full month of such year during which such building was in service, and
(ii) the denominator of which is 12.
(B) Disallowed 1st year credit allowed in 11th year
Any reduction by reason of subparagraph (A) in the credit allowable (without regard to subparagraph (A)) for the 1st taxable year of the credit period shall be allowable under subsection (a) for the 1st taxable year following the credit period.
(3) Determination of applicable percentage with respect to increases in qualified basis after 1st year of credit period
(A) In general
In the case of any building which was a qualified low-income building as of the close of the 1st year of the credit period, if—
(i) as of the close of any taxable year in the compliance period (after the 1st year of the credit period) the qualified basis of such building exceeds
(ii) the qualified basis of such building as of the close of the 1st year of the credit period,
the applicable percentage which shall apply under subsection (a) for the taxable year to such excess shall be the percentage equal to 2/3 of the applicable percentage which (after the application of subsection (h)) would but for this paragraph apply to such basis.
(B) 1st year computation applies
A rule similar to the rule of paragraph (2)(A) shall apply to any increase in qualified basis to which subparagraph (A) applies for the 1st year of such increase.
(4) Dispositions of property
If a building (or an interest therein) is disposed of during any year for which credit is allowable under subsection (a), such credit shall be allocated between the parties on the basis of the number of days during such year the building (or interest) was held by each. In any such case, proper adjustments shall be made in the application of subsection (j).
(5) Credit period for existing buildings not to begin before rehabilitation credit allowed
(A) In general
The credit period for an existing building shall not begin before the 1st taxable year of the credit period for rehabilitation expenditures with respect to the building.
(B) Acquisition credit allowed for certain buildings not allowed a rehabilitation credit
(i) In general In the case of a building described in clause (ii)—
(I) subsection (d)(2)(B)(iv) shall not apply, and
(II) the credit period for such building shall not begin before the taxable year which would be the 1st taxable year of the credit period for rehabilitation expenditures with respect to the building under the modifications described in clause (ii)(II).
(ii) Building described A building is described in this clause if—
(I) a waiver is granted under subsection (d)(6)(C) with respect to the acquisition of the building, and
(II) a credit would be allowed for rehabilitation expenditures with respect to such building if subsection (e)(3)(A)(ii)(I) did not apply and if the dollar amount in effect under subsection (e)(3)(A)(ii)(II) were two-thirds of such amount.
(g) Qualified low-income housing project
For purposes of this section—
(1) In general
The term “qualified low-income housing project” means any project for residential rental property if the project meets the requirements of subparagraph (A) or (B) whichever is elected by the taxpayer:
(A) 20–50 test
The project meets the requirements of this subparagraph if 20 percent or more of the residential units in such project are both rent-restricted and occupied by individuals whose income is 50 percent or less of area median gross income.
(B) 40–60 test
The project meets the requirements of this subparagraph if 40 percent or more of the residential units in such project are both rent-restricted and occupied by individuals whose income is 60 percent or less of area median gross income.
Any election under this paragraph, once made, shall be irrevocable. For purposes of this paragraph, any property shall not be treated as failing to be residential rental property merely because part of the building in which such property is located is used for purposes other than residential rental purposes.
(2) Rent-restricted units
(A) In general
For purposes of paragraph (1), a residential unit is rent-restricted if the gross rent with respect to such unit does not exceed 30 percent of the imputed income limitation applicable to such unit. For purposes of the preceding sentence, the amount of the income limitation under paragraph (1) applicable for any period shall not be less than such limitation applicable for the earliest period the building (which contains the unit) was included in the determination of whether the project is a qualified low-income housing project.
(B) Gross rent
For purposes of subparagraph (A), gross rent—
(i) does not include any payment under section 8 of the United States Housing Act of 1937 or any comparable rental assistance program (with respect to such unit or occupants thereof),
(ii) includes any utility allowance determined by the Secretary after taking into account such determinations under section 8 of the United States Housing Act of 1937,
(iii) does not include any fee for a supportive service which is paid to the owner of the unit (on the basis of the low-income status of the tenant of the unit) by any governmental program of assistance (or by an organization described in section 501 (c)(3) and exempt from tax under section 501 (a)) if such program (or organization) provides assistance for rent and the amount of assistance provided for rent is not separable from the amount of assistance provided for supportive services, and
(iv) does not include any rental payment to the owner of the unit to the extent such owner pays an equivalent amount to the Farmers’ Home Administration under section 515 of the Housing Act of 1949.
For purposes of clause (iii), the term “supportive service” means any service provided under a planned program of services designed to enable residents of a residential rental property to remain independent and avoid placement in a hospital, nursing home, or intermediate care facility for the mentally or physically handicapped. In the case of a single-room occupancy unit or a building described in subsection (i)(3)(B)(iii), such term includes any service provided to assist tenants in locating and retaining permanent housing.
(C) Imputed income limitation applicable to unit
For purposes of this paragraph, the imputed income limitation applicable to a unit is the income limitation which would apply under paragraph (1) to individuals occupying the unit if the number of individuals occupying the unit were as follows:
(i) In the case of a unit which does not have a separate bedroom, 1 individual.
(ii) In the case of a unit which has 1 or more separate bedrooms, 1.5 individuals for each separate bedroom.
In the case of a project with respect to which a credit is allowable by reason of this section and for which financing is provided by a bond described in section 142 (a)(7), the imputed income limitation shall apply in lieu of the otherwise applicable income limitation for purposes of applying section 142 (d)(4)(B)(ii).
(D) Treatment of units occupied by individuals whose incomes rise above limit
(i) In general Except as provided in clause (ii), notwithstanding an increase in the income of the occupants of a low-income unit above the income limitation applicable under paragraph (1), such unit shall continue to be treated as a low-income unit if the income of such occupants initially met such income limitation and such unit continues to be rent-restricted.
(ii) Next available unit must be rented to low-income tenant if income rises above 140 percent of income limit If the income of the occupants of the unit increases above 140 percent of the income limitation applicable under paragraph (1), clause (i) shall cease to apply to such unit if any residential rental unit in the building (of a size comparable to, or smaller than, such unit) is occupied by a new resident whose income exceeds such income limitation. In the case of a project described in section 142 (d)(4)(B), the preceding sentence shall be applied by substituting “170 percent” for “140 percent” and by substituting “any low-income unit in the building is occupied by a new resident whose income exceeds 40 percent of area median gross income” for “any residential unit in the building (of a size comparable to, or smaller than, such unit) is occupied by a new resident whose income exceeds such income limitation”.
(E) Units where Federal rental assistance is reduced as tenant’s income increases
If the gross rent with respect to a residential unit exceeds the limitation under subparagraph (A) by reason of the fact that the income of the occupants thereof exceeds the income limitation applicable under paragraph (1), such unit shall, nevertheless, be treated as a rent-restricted unit for purposes of paragraph (1) if—
(i) a Federal rental assistance payment described in subparagraph (B)(i) is made with respect to such unit or its occupants, and
(ii) the sum of such payment and the gross rent with respect to such unit does not exceed the sum of the amount of such payment which would be made and the gross rent which would be payable with respect to such unit if—
(I) the income of the occupants thereof did not exceed the income limitation applicable under paragraph (1), and
(II) such units were rent-restricted within the meaning of subparagraph (A).
The preceding sentence shall apply to any unit only if the result described in clause (ii) is required by Federal statute as of the date of the enactment of this subparagraph and as of the date the Federal rental assistance payment is made.
(3) Date for meeting requirements
(A) In general
Except as otherwise provided in this paragraph, a building shall be treated as a qualified low-income building only if the project (of which such building is a part) meets the requirements of paragraph (1) not later than the close of the 1st year of the credit period for such building.
(B) Buildings which rely on later buildings for qualification
(i) In general In determining whether a building (hereinafter in this subparagraph referred to as the “prior building”) is a qualified low-income building, the taxpayer may take into account 1 or more additional buildings placed in service during the 12-month period described in subparagraph (A) with respect to the prior building only if the taxpayer elects to apply clause (ii) with respect to each additional building taken into account.
(ii) Treatment of elected buildings In the case of a building which the taxpayer elects to take into account under clause (i), the period under subparagraph (A) for such building shall end at the close of the 12-month period applicable to the prior building.
(iii) Date prior building is treated as placed in service For purposes of determining the credit period and the compliance period for the prior building, the prior building shall be treated for purposes of this section as placed in service on the most recent date any additional building elected by the taxpayer (with respect to such prior building) was placed in service.
(C) Special rule
A building—
(i) other than the 1st building placed in service as part of a project, and
(ii) other than a building which is placed in service during the 12-month period described in subparagraph (A) with respect to a prior building which becomes a qualified low-income building,
shall in no event be treated as a qualified low-income building unless the project is a qualified low-income housing project (without regard to such building) on the date such building is placed in service.
(D) Projects with more than 1 building must be identified
For purposes of this section, a project shall be treated as consisting of only 1 building unless, before the close of the 1st calendar year in the project period (as defined in subsection (h)(1)(F)(ii)), each building which is (or will be) part of such project is identified in such form and manner as the Secretary may provide.
(4) Certain rules made applicable
Paragraphs (2) (other than subparagraph (A) thereof), (3), (4), (5), (6), and (7) of section 142 (d), and section 6652 (j), shall apply for purposes of determining whether any project is a qualified low-income housing project and whether any unit is a low-income unit; except that, in applying such provisions for such purposes, the term “gross rent” shall have the meaning given such term by paragraph (2)(B) of this subsection.
(5) Election to treat building after compliance period as not part of a project
For purposes of this section, the taxpayer may elect to treat any building as not part of a qualified low-income housing project for any period beginning after the compliance period for such building.
(6) Special rule where de minimis equity contribution
Property shall not be treated as