(1)in a residential area-(a)in a site abutting a public street which is not a service lane, 15 feet from the rear boundary of the site;(b)in a site abutting a service lane 7½ feet from centre line of the service lane for unstoreyed structure abutting the land and further 10 feet on the first floor for structure abutting the lane;(c)where the area of a site is contiguous with the rear of another site, that is, where the rear of the boundary of the site does not about on a service lane if the area of the site exceeds 300 sq. yards but does not exceed 500 sq. yards and 15 feet in other cases;Provided that if the site does not exceed 300 sq. yards the minimum space to be left at the rear boundary of the site, shall be 6 feet.
