For purposes of this chapter, the words ''rent control'' shall mean:
(a) any regulation that in any way requires below-market rents for residential properties; and
(b) any regulation that is part of a regulatory scheme of rent control as defined in clause (a), including the regulation of occupancy, services, evictions, condominium conversion and the removal of properties from such rent control scheme; except that
(c) this definition does not include the regulation of, or agreements affecting, publicly owned housing, publicly subsidized housing, federally assisted housing, or mobile homes.