(a) The Authority may make, purchase, or participate in loans, grants, or deferred payment loans to persons and families of low and moderate income and to not-for-profit and limited-profit entities for the benefit of low and moderate income persons and families, to finance the development, improvement or rehabilitation of residential real property. When financing loans, grants, or deferred payment loans under this Section, the Authority may give priority to applications which include energy conservation measures including, but not limited to, solar energy systems.
     (b) A loan or deferred payment loan under this Section may be secured or unsecured as determined by the Authority. A grant may be secured or unsecured as determined by the Authority, and shall be made under additional terms and conditions determined by the Authority.
     (c) Loans under this Section may be in such principal amounts, bear interest at such rates, have such other terms and conditions and be repaid within such period as the Authority may determine.
     (d) Loans under this Section financed by Affordable Housing Program Trust Fund Bonds or Notes or from Trust Fund Moneys shall be restricted to the purposes and subject to the limitations on use provided in the Illinois Affordable Housing Act.