The Department shall operate the Program and make Program loans. As much as possible, the Program shall be administered: in conjunction with federal programs assisting rehabilitation of housing, to ensure maximum use of available federal money; and consistently with locally approved plans or programs of concentrated neighborhood revitalization. Except for Program loans made under a special loan program, the Regular Rehabilitation Program consists of Program loans to rehabilitate residential buildings providing four or fewer dwellings. The Special Rehabilitation Program consists of Program loans made under a special loan program.