As the Chausse language suggests, Massachusetts case law recognizes a distinction between the leased premises themselves and “common” or “appurtenant” areas outside the leased premises, such that ordinarily, the tenant is responsible for the leased premises and the landlord, perhaps jointly with the tenant, is responsible for common or appurtenant areas. See, e.g., Tuchinsky v. Beacon Prop. Mgt. Corp., 45 Mass. App. Ct. 469, 470 (1998) (“By designation in the lease, the elevator lobby [where the accident occurred] was part of the leased premises. It was not common area and was not used by anyone except [the commercial tenant] and its invitees. . . . The allegedly unsafe door was not in a common area. It was within the leased area, and it was not in an area appurtenant to the leased area” [emphasis in original]; landlord of multitenant commercial building not liable for injury to tenant’s employee); Monterosso v. Gaudette, 8 Mass. App. Ct. 93, 97-100, 102 (1979) (commercial landlord and one tenant in multitenant building not entitled to directed verdicts on negligence claims; evidence warranted findings that both landlord and tenant exercised control over appurtenant area where accident occurred). Gateway leased the entire building from the landlord, including the stairway where Humphrey’s accident occurred. It was Gateway’s responsibility to keep the leased premises safe, as nothing in the lease imposes this responsibility on the landlord. Sheehan v. El Johnan, Inc., 38 Mass. App. Ct. 975, 975 (1995), and cases cited (“If a tenant . . . occupies the entire premises — i.e., there are no areas used in common with other tenants — then the tenant is responsible for keeping the premises safe, absent a contractual undertaking to the contrary by the landlord”). Under these long-standing rules, the landlord is not Hable for Humphrey’s injury.