Cambridge Mun. Code Title 8 (Health and Safety) § 8.44.020

rent such unit in good faith or, when a unit is cited as unfit for human habitation, by failure to perform repairs required to restore such unit to habitable condition. The existence of a vacancy for one hundred twenty days

Cambridge Mun. Code Title 8 (Health and Safety) § 8.60.020

means every building or shelter including, but not limited to, roominghouses and temporary housing used or intended for human habitation and every other structure or condition located within the same lot line whose existence causes or is likely to effect