The subjects comprise the former Council Offices, known as Cornerstone, 29 Bank Street, Annan. The property was built circa 1840 along with 27 Bank Street as a Bank and Bank Manager's house. No. 27 is the former Banking Office.
The property, including gatepiers and railings, is Category A Listed by Historic Scotland. Cornerstone is a substantial three storey semi-detached building, comprising basement, ground floor and first floor. The building is of sandstone (red ashlar) construction under a pitched slated roof.
Internally, the property retains many original features, but is in need of some refurbishment and decoration throughout.