Conventional Loan Repair Escrow Home Rehab Calculator Abilene Rehab Also remember that taking assistance of rehab calculator allows to make reliable determination. The FHA 203k Loan can be a perfect all-in-one purchase and renovation loan for home buyers. But not every home improvement plan is the same. Before you invest time and money, you should know if the 203k Loan will work for you.Fannie mae investor loans fannie mae – Overview, History, and How It Works – Even after selling the mortgage-backed securities to investors, fannie mae continues to own the underlying mortgages. It also pays the investors a share of the monthly mortgage payment on a pro-rata basis. fannie mae guarantees that it will make monthly payments on the mortgage-backed securities, inclusive of the principal and interest.