Union Square is a major heritage precinct. It includes the Post Office in Harris Street, The Harlequin Inn pub, two bank buildings in Union Street, the homes from 4-20 Union Street, all buildings from 99 to 125 Harris Street, the terrace from 135 to 141 Harris Street and terraces from 1-21 Paternoster Row. All of these buildings are listed on the defunct Register of the National Estate. Also on the defunct Register is the Waite and Bull building at 137 Pyrmont Bridge Road.