The following text is from the original listed building designation:
1. 5275 THE QUAY (South Side)
Bastion TR 3358 1/184
II GV
2. This building forms part of the town wall, but very little remains except one arched doorway at 1st floor level. It has been entirely rebuilt internally. Although now virtually modern the exterior preserves the ancient character of the walling at this point. Built of C17 warm yellow brick, flint and stone. The roof is tiled with Dutch pantiles and some plain tiles.
The whole area of buildings or walls facing the Quay with Nos 3 and 5 Upper Strand Street form a group.
Listing NGR: TR3330558178

English Heritage, List of Buildings of Special Architectural or Historic Interest (Map). SKE16160.