law: The Cantonments (House-Accommodation) Act, 1923
  10. Houses not to be appropriated in certain cases.-
  No notice shall be issued under section 7 if the house-
  (a) was, at the date of the issue of the notification declaring this Act or the 5Cantonment (House- Accommodation) Act, 1902 (2 of 1902), as the case may be, to be operative in the cantonment or part of the cantonment, or is, with such sanction as is required by section 9, occupied as a hospital, school, school hostel, bank, hotel or shop, and has been so occupied continuously during the three years immediately preceding the time when the occasion for issuing the notice arises, or
  (b) was, at the date of such a notification as is referred to in clause (a), or is, with such sanction as aforesaid, occupied by a railway administration or by a company or firm engaged in trade or business or by a dill), or
  (c) is occupied by the owner, or
  (d) has been appropriated by the State Government with the concurrence of the Officer Commanding the District, or by the Central Government, for use as a public office or for any other purpose.