For purposes of this chapter, the words ''rent control'' shall mean:\n(a) any regulation that in any way requires below-market rents for residential properties; and\n(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\n(c) this definition does not include the regulation of, or agreements affecting, publicly owned housing, publicly subsidized housing, federally assisted housing, or mobile homes.
Massachusetts Legal Code