Section 69A(1)(c) in Kolkata Municipal Corporation Building Rules, 2009
(c)in areas located within 500 meters on either side of the operational metro corridor or under Construction Metro Corridor where Construction work has actually began, a maximum of 15% additional Floor Area Ratio may be allowed over the prescribed limit in respect of the properties abutting means of access of 15 meters to less than 24 meters, and a maximum of 20% addition Floor Area Ratio may be allowed over the prescribed limit for properties abutting means of access 24 meters and above.