Section 172(1)(a) in Government of India Act, 1935
(a)in the case of lands and buildings which are situate in a Province, vest in His Majesty for the purposes of the government of that Province unless they were then used, otherwise than under a tenancy agreement between the Governor-General in Council and the Government of that Province, for purposes which thereafter will be purposes of the Federal Government or of His Majesty's Representative for the exercise of the functions of the Crown in its relations with Indian States, or unless they are lands and buildings formerly used for such purposes as aforesaid, or intended or formerly intended to be so used, and are certified by the Governor-General in Council or, as the case may be, His Majesty's Representative, to have been retained for future use for such purposes, or to have been retained temporarily for the purpose of more advantageous disposal by sale or otherwise ;