Section 536(1) in The Calcutta Municipal Corporation Act, 1980
(1)Whenever it is provided in this Act that the Municipal Commissioner may acquire, or whenever it is necessary or expedient for any purpose of this Act that the Municipal Commissioner shall acquire, any immovable property, such property may be acquired by the Municipal Commissioner on behalf of the Corporation by agreement on such terms and at such rates or prices or at rates or prices not exceeding such maxima as may be approved by the Mayor-in-Council either generally for any class of cases or specially in any particular case.