The Administration shall administer a program of financial assistance for: community development projects; energy conservation projects; home improvement projects; public purpose projects; solar energy projects; special housing facilities; and business projects. The Administration shall provide financial assistance for projects and facilities under this section with money that the Administration can get for them from any source, including: payments under federal law; bonds or notes issued by the Administration; bonds or notes issued by the State; and mortgage-backed securities and proceeds of investments in them. A loan for a home improvement project having a principal balance exceeding $5,000 shall be secured by a mortgage. Subject to an agreement with noteholders or bondholders, the Administration may consent that a loan, loan commitment, or agreement to which the Administration is a party be modified as to: the interest rate; the time of payments of an installment of principal or interest; security; or any other term.