Section 2(68) in Kolkata Municipal Corporation Act, 1980
(68)"private street" means any street, road, lane, gully, alley, passage or square which is not a public street, and includes any passage securing access to four or more premises belonging to the same or different owners, but does not include a passage provided in effecting a partition of any masonry building amongst joint owners where such passage is less than two metres and fifty centimetres wide;
