; and (12) carrying out such activities as the Secretary determines appropriate to promote the purpose described in subsection (a). (f) Forms of assistance A recipient of a grant under this section may use the grant to provide eligible activities described in subsection (e) through a variety of funding approaches, including subgrants, loans, equity investments, revolving loan funds, loan funds, loan guarantees, interest write-downs, and other forms of assistance approved by the Secretary for purposes of this section. (g) Matching requirement As a condition on receipt of a grant under this section, a grantee shall agree to make contributions toward the cost of activities funded through the grant for a fiscal year in an amount that is not less than 4 percent of the total amount of the grant for such fiscal year. (h) Supplement not supplant As a condition on receipt of a grant under this section, a grantee shall agree to use amounts received through the grant to supplement and not supplant funds used by the grantee for eligible activities described in subsection (e). (i) Limitation on administrative expenses As a condition on receipt of a grant under this section, a grantee shall ensure that not more than 10 percent of the grant is used for administrative expenses. (j) Financial records As a condition on receipt of a grant under this section, a grantee shall agree to maintain and provide the Secretary with financial records sufficient, in the determination of the Secretary, to ensure proper accounting and disbursing of amounts made available to the grantee through the grant. (k) Affordability maintenance As a condition on receipt of a grant under this section, a grantee shall agree to require the owner of any rental property receiving assistance through the grant, for a period of 3 years after lead remediation at the rental property pursuant to such assistance, or throughout the term of any loan made to the owner pursuant to the grant, whichever is longer— (1) to maintain the affordability of rental units at the