In a move that could make foreclosed properties more attractive to investors and increase the number of homes available to first-time buyers, the federal government is temporarily lifting a prohibition against providing FHA mortgage insurance for homes that are resold within 90 days. The waiver on the purchase of flipped houses with FHA mortgages, which begins February 1 and is effective for one year, “will give FHA borrowers access to a broader array of recently foreclosed properties,” HUD said Friday in announcing the change. Conditions attached to the waiver are expected to prevent what HUD called “predatory practices” by investors.