Section 61(3) in Kolkata Municipal Corporation Building Rules, 2009
(3)Every building shall have exterior open spaces comprising front open space, rear open space and side open space as mentioned in rule 62 to rule 69. The minimum width prescribed for front open space, rear open space and side open spaces shall be provided along the entire front, rear and side faces of the building respectively. For this purpose, the front of the building shall be that face of the building, which faces the means of access of the building. These provisions shall also be applicable to each individual building when a plot of land contains more than one building, provided that the rear open space for this purpose is to be taken as the average width available along the entire rear face of the building with the minimum width available being not less than 50% of the stipulated width.
