The Department may make Program loans for housing on terms that the Department considers necessary to make the housing affordable to families of limited income. The Department may make Program loans in the form of a grant to a family of limited income if: the family of limited income owns and occupies the dwelling; and the Department determines the family of limited income cannot undertake the rehabilitation project without a grant. The terms may include: deferred payment of principal and interest until the maturity date or the date of any sale or other transfer of the building or an interest in the building; an interest rate as low as 0% or as high as is reasonable, given the incomes of the proposed occupants, if the interest rate does not violate any federal regulation governing the borrowing of money by the State; increased interest rates or accelerated payments of principal and interest, if the borrower no longer qualifies for the Program loan; and advance payments to a nonprofit sponsor for certain development costs, including architectural, engineering, and attorneys’ fees. Within the maximum income limits for families of limited income, the Secretary may establish: lower income ranges; interest rates to be available on Program loans serving occupants with incomes within those lower ranges; and any preference or reservation of money for applications for Program loans to finance housing to serve occupants in those lower income ranges.