The commission, in cooperation with the *department of community, trade, and economic development, and the state investment board, shall develop and implement a housing finance program that:
(1) Provides subsidized or unsubsidized mortgage financing for single-family homeownership, including a single condominium unit, located in the state of Washington;
(2) Requests the state investment board to make investments, within its policies and investment guidelines, in mortgage-backed securities that are collateralized by loans made within the state of Washington; and
(3) Provides flexible loan underwriting guidelines, including but not limited to provisions that will allow reduced downpayment requirements for the purchaser.