Section 3 of the Town and Country Planning Act, 1981 (Tamil Nadu Act 40 of 1981) which was not incorporated in the Principal Act is as follows:-
Validation of certain building plans sanctioned by the Municipal Corporation of Chennai.- Notwithstanding anything contained in the Tamil Nadu Town and Country Planning Act, 1971 (Tamil Nadu Act 35 of 1972) (hereinafter referred to as the said Act or in any other law relating to local authorities for the time being in force, or in any detailed development plan, made or deemed to be made under the said Act, or in any judgment, decree or order of any court or other authority, any building plan, sanctioned during the period commencing on the 15th August, 1974 and ending with the 1st October, 1980, by the Municipal Corporation of Chennai providing for the construction of more than one dwelling-house on any one site or providing for the construction of any building with variation in regard to requirement of plot extent or plot coverage or open space shall be deemed to have been validly sanctioned by the said Municipal Corporation of Chennai in accordance with law, as if section 2 of this Act had been in force at all material times and any building constructed or under construction in pursuance of such building plan shall not be deemed to have been or to be undertaken or carried out unlawfully, on the ground that such construction provides for more than one dwelling-house or varies in regard to the requirement of extent of plot or plot coverage or open space.