Any owner or lessor of the entirety of a building subject to this chapter, or any agent thereof with the responsibility for managing such building (hereafter "building operator") shall ensure that the elevator is accessible, usable and in good working order at all times as further provided in Section 19.50.050. Notice that any elevator is to be repaired and the time in which such repairs are to be completed shall be provided as set forth in Section 19.50.040. No duty is imposed under this chapter on any elevator service company which contracts with a building operator to service elevators. Any contractual provision which purports to impose such liability either directly or by way of indemnification of the building operator for violation of this chapter is hereby declared to be against public policy and void. (Ord. 6245-NS § 3, 1994)