To be eligible for insurance under this section a mortgage on any property or project of a corporation or trust of the character described in paragraph (2) of subsection (a) of this section shall involve a principal obligation in an amount not to exceed a sum computed on the basis of a separate mortgage for each single-family dwelling (irrespective of whether such dwelling has a party wall or is otherwise physically connected with another dwelling or dwellings) comprising the property or project, equal to the total of each of the maximum principal obligations of such mortgages which would meet the requirements of section 1709(b)(2) of this title if the mortgagor were the owner and occupant who had made any required payment on account of the property prescribed in such paragraph.

Any mortgage insured under this section shall provide for complete amortization by periodic payments within such term as the Secretary may prescribe but not to exceed 40 years from the beginning of amortization of the mortgage, and shall bear interest at such rate as may be agreed upon by the mortgagor and the mortgagee. The Secretary may consent to the release of a part or parts of the mortgaged property from the lien of the mortgage upon such terms and conditions as he may prescribe and the mortgage may provide for such release, and a mortgage on any project of a corporation or trust of the character described in paragraph (2) of subsection (a) of this section may provide that, at any time after the completion of the construction of the project, such mortgage may be replaced, in whole or in part, by individual mortgages covering each individual dwelling in the project in amounts not to exceed the unpaid balance of the blanket mortgage allocable to the individual property. Each such individual mortgage may be insured under this section. Property covered by a mortgage, insured under this section, on a property or project of a corporation or trust of the character described in paragraph (1) of subsection (a) of this section may include five or more family units and may include such commercial and community facilities as the Secretary deems adequate to serve the occupants. Property held by a corporation or trust of the character described in paragraph numbered (2) of subsection (a) of this section which is covered by a mortgage insured under this section may include such community facilities, and property held by a mortgagor of the character described in paragraph numbered (3) of subsection (a) of this section which is covered by a mortgage insured under this section may include such commercial and community facilities, as the Secretary deems adequate to serve the occupants.

The provisions of subsections (d), (e), (g), (h), (i), (j), (k), (l), and (n) of section 1713 of this title shall be applicable to mortgages insured under this section except individual mortgages insured pursuant to subsection (d) of this section covering the individual dwellings in the project, and as to such individual mortgages the provisions of subsections (a), (c), (d), (e), (f), (g), (h),¹ (j), and (k) ¹ of section 1710 of this title shall be applicable: Provided, That as applied to mortgages or loans the insurance for which is the obligation of the Management Fund (1) all references to the General Insurance Fund shall be construed to refer to the Management Fund, and (2) all references to section 1713 of this title shall be construed to refer to subsections (a)(1), (a)(3) (if the project involved is acquired by a cooperative corporation), (i), and (j) of this section.

The Secretary is authorized, with respect to mortgages insured or to be insured under this section, to furnish technical advice and assistance in the organization of corporations or trusts of the character described in subsection (a) of this section and in the planning, development, construction, and operation of their housing projects.

Nothing in this chapter shall be construed to prevent the insurance of a mortgage under this section covering a housing project designed for occupancy by single persons, and dwelling units in such a project shall constitute family units within the meaning of this section.

In the event that a mortgagor of the character described in paragraph (3) of subsection (a) obtains an insured mortgage loan pursuant to this section and fails to sell the property or project covered by such mortgage to a nonprofit housing corporation or nonprofit housing trust of the character described in paragraph (1) of subsection (a), the Secretary is authorized to refuse, for such period of time as he shall deem appropriate under the circumstances, to insure under this section any additional investor-sponsor type mortgage loans made to such mortgagor or to any other investor-sponsor mortgagor where, in the determination of the Secretary, any of its stockholders were identified with such mortgagor.

Nothing in this chapter shall be construed to prevent the insurance of a mortgage executed by a mortgagor of the character described in paragraph (1) of subsection (a) of this section covering property upon which dwelling units and related facilities have been constructed prior to the filing of the application for mortgage insurance hereunder: Provided, That the Secretary determines that the consumer interest is protected and that the mortgagor will be a consumer cooperative. In the case of properties other than new construction, the limitations in this section upon the amount of the mortgage shall be based upon the appraised value of the property for continued use as a cooperative rather than upon the Secretary’s estimate of the replacement cost. As to any project on which construction was commenced after September 23, 1959, the mortgage on such proj­ect shall be eligible for insurance under this section only in those cases where the construction was subject to inspection by the Secretary and where there was compliance with the provisions of section 1715c of this title. As to any project on which construction was commenced prior to September 23, 1959, such inspection, and compliance with the provisions of section 1715c of this title, shall not be a prerequisite.

There is hereby created a Cooperative Management Housing Insurance Fund (hereinafter referred to as the “Management Fund”). The Management Fund shall be used by the Secretary as a revolving fund for carrying out the provisions of this section with respect to mortgages or loans insured, on or after August 10, 1965, under subsections (a)(1), (a)(3) (if the project is acquired by a cooperative corporation), (i), and (j). The Management Fund shall also be used as a revolving fund for mortgages, loans, and commitments transferred to it pursuant to subsection (m). The Secretary is directed to transfer to the Management Fund from the General Insurance Fund an amount equal to the total of the premium payments theretofore made with respect to the insurance of mortgages and loans transferred to the Management Fund pursuant to subsection (m) minus the total of any administrative expenses theretofore incurred in connection with such mortgages and loans, plus such other amounts as the Secretary determines to be necessary and appropriate. General expenses of operation of the Department of Housing and Urban Development relating to mortgages or loans which are the obligation of the Management Fund may be charged to the Management Fund.

The Secretary shall establish in the Management Fund, as of August 10, 1965, a General Surplus Account and a Participating Reserve Account. The aggregate net income thereafter received or any net loss thereafter sustained by the Management Fund, in any semiannual period, shall be credited or charged to the General Surplus Account or the Participating Reserve Account or both in such manner and amounts as the Secretary may determine to be in accord with sound actuarial and accounting practice. Upon termination of the insurance obligation of the Management Fund by payment of any mortgage or loan insured under this section, and at such time or times prior to such termination as the Secretary may determine, the Secretary is authorized to distribute to the mortgagor or borrower a share of the Participating Reserve Account in such manner and amount as the Secretary shall determine to be equitable and in accordance with sound actuarial and accounting practice: Provided, That in no event shall the amount of the distributable share exceed the aggregate scheduled annual premiums of the mortgagor or borrower to the year of payment of the share less the total amount of any share or shares previously distributed by the Secretary to the mortgagor or borrower: And provided further, That in no event may a distributable share be distributed until any funds transferred from the General Insurance Fund to the Management Fund pursuant to subsection (o) have been repaid in full to the General Insurance Fund. No mortgagor, mortgagee, borrower, or lender shall have any vested right in a credit balance in any such account or be subject to any liability arising out of the mutuality of the Management Fund. The determination of the Secretary as to the amount to be paid by him to any mortgagor or borrower shall be final and conclusive.

The Secretary is authorized to transfer to the Management Fund commitments for insurance issued under subsections (a)(1), (i), and (j) prior to August 10, 1965, and to transfer to the Management Fund the insurance of any mortgage or loan insured prior to August 10, 1965, under subsection (a)(1), (a)(3) (if the project is acquired by a cooperative corporation), (i), or (j): Provided, That the insurance of any mortgage or loan shall not be transferred under the provisions of this subsection if on August 10, 1965, the mortgage or loan is in default and the mortgagee or lender has notified the Secretary in writing of its intention to file an insurance claim. Any insurance or commitment not so transferred shall continue to be an obligation of the General Insurance Fund.

Notwithstanding the limitations contained in other provisions of this chapter, premium charges for mortgages or loans the insurance of which is the obligation of either the Management Fund or the General Insurance Fund may be payable in debentures issued in connection with mortgages or loans transferred to the Management Fund or in connection with mortgages or loans insured pursuant to commitments transferred to the Management Fund, as provided in subsection (m) of this section. Premium charges on the insurance of mortgages or loans transferred to the Management Fund or insured pursuant to commitments transferred to the Management Fund may be payable in debentures which are the obligation of either the Management Fund or the General Insurance Fund.

Notwithstanding any other provision of this chapter the Secretary is authorized to transfer funds between the Cooperative Management Housing Insurance Fund and the General Insurance Fund in such amounts and at such times as he may determine, taking into consideration the requirements of each such Fund, to assist in carrying out effectively the insurance programs for which such Funds were respectively established. Moneys in the Cooperative Management Housing Insurance Fund not needed for current operations of the fund shall be deposited with the Treasurer of the United States to the credit of the Cooperative Management Housing Insurance Fund or invested in bonds or other obligations of, or in bonds or other obligations guaranteed as to principal and interest by, the United States or any agency of the United States: Provided, That such moneys shall to the maximum extent feasible be invested in such bonds or other obligations the proceeds of which will be used to directly support the residential mortgage market. The Secretary may, with the approval of the Secretary of the Treasury, purchase in the open market debentures which are the obligations of the Cooperative Management Housing Insurance Fund. Such purchases shall be made at a price which will provide an investment yield of not less than the yield obtainable from other investments authorized by this subsection. Debentures so purchased shall be canceled and not reissued.

Notwithstanding any other provision of this section, the project mortgage amounts which may be insured under this section may be increased by up to 20 per centum if such increase is necessary to account for the increased cost of the project due to the installation therein of a solar energy system (as defined in subparagraph (3) of the last paragraph of section 1703(a) of this title) or residential energy conservation measures (as defined in section 8211(11)(A) through (G) and (I) of title 42) ¹ in cases where the Secretary determines that such measures are in addition to those required under the minimum property standards and will be cost-effective over the life of the measure.