Section 8(2)(iii) in West Bengal Municipal (Building) Rules, 2007
(iii)structure related to public amenities provided that the height of such buildings shall not exceed 4.00 metres and that total area covered by such building shall not exceed 10% of the total area of the parks and public open spaces, 5% in the case of medium parks and public open spaces and 3% in the case of large parks and public open spaces.