It is hereby declared as a matter of public policy that the preservation and protection of buildings, structures, sites, objects, and districts of historic, architectural, cultural, archaeological, educational, and aesthetic merit are public necessities and are in the interests of the health, prosperity, and welfare of the people of Philadelphia. The purposes of this Chapter 14-1000 are to:
(3) Encourage the restoration and rehabilitation of buildings, structures, sites, and objects that are designated as historic or that are located within and contribute to the character of districts designated as historic without displacing elderly, long-term, and other residents living within those districts;