In this subtitle the following words have the meanings indicated. “Affordable” means that monthly housing costs are affordable to a family of limited income as determined under § 4–212 of this title. “Appraisal gap” means the amount by which the total cost of eligible construction expenses exceeds the contract sales price of a qualified property when it is initially sold to an owner–occupant. “Eligible construction expenses” means any amount that is expended on the construction or substantial rehabilitation of a qualified property. “Eligible construction expenses” includes any amount expended on: acquisition costs; roof repair and replacement; chimney repair and lining; internal and external doors; windows; masonry; floor joists; finished flooring; framing; structural repairs; foundation repairs; plumbing, electrical, and mechanical systems; architectural and engineering consulting fees; tools and equipment rental; new construction; infrastructure; and other expenses as determined by the Secretary. “Financial assistance” includes: a grant; a loan; a reduction in the principal obligation of or rate of interest payable on a loan or portion of a loan; a prepayment of interest on a subordinate or superior loan or portion of a loan; an assurance; a guarantee; and any other form of credit enhancement. “Fund” means the Appraisal Gap From Historic Redlining Financial Assistance Fund established under this subtitle. “Qualified project” means the construction or substantial rehabilitation of a qualified property if the eligible construction expenses do not exceed $500,000. “Qualified property” means residential real property that is: newly constructed or a formerly vacant structure that has been substantially rehabilitated; located in: A low–income census tract as defined by the U.S. Department of Housing and Urban Development; and an area designated as a sustainable community; or an area that meets criteria established by the Department for the identification neighborhoods that: have been historically redlined; or have undergone urban renewal; and constructed or rehabilitated with the purpose of being sold to an owner–occupant at an affordable sales price. “Sustainable community” means an area designated as a sustainable community under § 6–205 of this article.