Section 354RO(2) in The Mumbai Municipal Corporation Act, 1888
(2)The Commissioner may, with the consent of and subject to any conditions imposed by, the State Government acquire land for the purposes of the foregoing section, notwithstanding that the land is not immediately required for those purposes:Provided that the Commissioner shall not be authorised to acquire any land compulsorily for those purposes unless it appears to the State Government that it is likely to be required for those purposes within ten years from the date on which they confirm the compulsory acquisition order.