425B. Power of Corporation to declare a building as a heritage building: Where the Corporation, on the recommendation of the Heritage Conservation Committee and also of the Mayor-in-Council, is of the opinion that any building in Kolkata should be preserved and conserved for historical, architectural, environmental or ecological purpose, it may declare such building as a heritage building:

Provided that during the period when any proposal for declaring building as a heritage building is under consideration of the Heritage Conservation Committee or the Mayor-in-Council, no owner of such building, or no lessee or sub-lessee to whom the building has been leased out, shall transfer such building by way of sale, lease or mortgage without prior approval of the Municipal Corporation.

425C. Gradation of heritage building: The gradation of a heritage building according to its historical, architectural, environmental or ecological purpose shall be such as may be prescribed.

425D. Heritage Conservation Committee: (1) The Mayor-in-Council shall constitute a Committee to be called the Heritage Conservation Committee with the Municipal Commissioner as its Chairman and an officer of the Corporation as its Convener.

(2) The Committee shall have, in addition to the Chairman and the Convener, seven other members of whom -

i) one shall be a nominee of the Kolkata Metropolitan Development Authority.
ii) One shall be the Director of the Development of Archaeology, Government of West Bengal, or his nominee.
iii) One shall be an eminent architect,
iv) One shall be an artist,
v) One shall be an environmentalist,
vi) One shall be a historian, and
vii) One shall be the Chief Valuer and Surveyor of the Corporation.

(3) The Committee may co-opt one person to be nominated by the concerned department of the State Government while dealing with any land or building under the management of the said department.

(4) The Committee shall, in accordance with the provisions of this Act and the rules and the regulations made there under, scrutinize every application or proposal for declaration of a building as a heritage building, and recommend to, and also advice, the Mayor-in-Council in respect of the preservation and conservation of such building as a heritage building.

(5) The Committee shall meet at such periodical interval as may be determined by the Mayor-in-Council.

(6) The Municipal Commissioner shall, in the case of emergency, take such measures as may be necessary for the preservation and conservation of a heritage building, provided that such measures shall be required to be approved by the heritage Conservation Committee at its meeting.

425E. Power and functions of Heritage Conservation Committee:The Heritage Conservation Committee shall have the power to function independent of the Municipal Building Committee for purpose of preservation, conservation and maintenance of heritage buildings in so far as such power does not any other provisions of this Act or the rules made there under relating to construction or use of building:

Provided that for erection or re-erection in a heritage building or part thereof, or for restoration of any heritage building to its old shape, design or beauty in the case of unlawful demolition, or for making any change of internal or external wall, structural pattern, floor, roof, interior or exterior architectural floor, façade or skyline, or for any other change, of a heritage building, the provisions of Chapters XXII and XXIII of this Act and the rules made there under shall apply mutatis mutandis.

425F. Power of Corporation to require, purchase or take on lease building: Subject to the other provisions of this Act, the Corporation may acquire, purchase or take on lease any heritage building for the purpose of preservation and conservation thereof:

Provided that in the case of a heritage building declared as such for the purpose of preservation and conservation as required under sub-clause (ii) of clause (a) of sub-section (4) of section 31 of the West Bengal Town and Country (Planning and Development) Act, 1979 (West Ben. Act XIII of 1979), the approval of the concerned department of the State Government shall be taken.

425G. Transfer of right of development for the purpose of acquisition by agreement: When the owner of any heritage building is not willing to preserve or conserve any heritage building, the Municipal Commissioner may, for the purpose of acquisition of such heritage building by agreement and on the recommendation of the Heritage Conservation Committee and with the approval of the Mayor-in-Council, allow the transfer of right of development of such heritage building, which shall be heritable and transferable, to the owner of such heritage building such manner, and subject to such may be prescribed.

Explanation I - "Development" shall have the same meaning as in clause (7) of section 2 of the West Bengal Town and Country (Planning and Development) Act, 1979 (West Ben. Act XIII of 1979).

Explanation II - "Right of development of a heritage building" shall mean the right of development, in the prescribed manner, of such potentials as may be available in respect of such heritage building on a plot of land different from the land and building comprising the heritage building but in the same ward of the Corporation.