“Development loan” means a loan, made prior to the granting of a construction loan, for planning, acquisition of land and improvements thereon, and site preparation for a housing development or residential structure. A development loan may include costs of architectural, engineering, legal and consulting services, the cost of necessary studies, surveys and governmental permits, and the cost of any other items that the agency deems reasonable and necessary for the initial preparation for construction or rehabilitation of a housing development or residential structure.