Section 354M(2) in The Mumbai Municipal Corporation Act, 1888
(2)(a)If at any time, it appears to the Commissioner, the [Improvement Committee] [These words were substituted for the words 'Mayor-in-Council' by Maharashtra 27 of 1999, Section 130, (w.e.f. 23-4-1999).] or the corporation, as the case may be, that an improvement can be made in any part of the scheme, the corporation may after the scheme for the purpose of making such improvement, and thereupon the Commissioner shall, subject to the provisions contained in the next two clauses of this sub-section, forthwith proceed to execute the scheme as altered.(b)If the estimated net cost of executing the scheme as altered exceeds by ten per cent the estimated net cost of executing the scheme as sanctioned, the Commissioner shall not, without the previous sanction of the corporation and of [the [State] [The words 'the Provincial Government' were substituted for the word 'Government' by the Adaptation of Indian Laws Order in Council.] Government], proceed to execute the scheme as altered.(c)If the scheme as altered involves the acquisition, otherwise than by agreement of any land other than that specified in the schedule accompanying the scheme under sub-section (3) of section 354L the provisions of section 354G and 354L and of sub-section (1) shall apply to the part of the scheme so altered, in the same manner as if such altered part were the scheme.