Section 4(1)(a) in Tripura Buildings (Lease and Rent Control) Act, 1975
(a)Every landlord may within fifteen days before completion and shall, within fifteen days after the construction or reconstruction of a building intended to be let out or after a building becomes vacant by his ceasing to occupy it, or by the termination of a tenancy, or by release from requisition by the State Government or any other competent authority, give notice of the availability or vacancy in writing to the Accommodation Controller.