Section 30(12) in Punjab Urban Planning and Development Building Rules, 2018
(12)Office-cum-letter box room. - In the case of multi-storeyed apartments, an officecum- letter box room of dimension of 3.6 m × 3 m shall be provided on the ground floor. In case the number of flats is more than 20, the maximum size of the officecum- letter box room shall be 20 m2.
