Vacate, it implies a unilateral act and all that is necessary is that the person in possession should give up his possession, AIR 1969 Bom 348 (350). [Bombay Rents, Hotel and Lodging House Rates Control Act (5 of 1947)]
Normally, means to go away, to leave, Surinder Singh Sibia v. Vijay Kumar Sood, AIR 1992 SC 1540 (1541): (1992) SCC 70.
1. To notify or cancel; make void; invalidate 2. To surrender occupying or possession, to move out or leave, Black's Law Dictionary, 7th Edn.