17-21 High Street, Ayr

17-21 High Street in Ayr is an early 19th-century, three-storey, three-bay tenement building that features ground floor shops. The exterior is finished in painted ashlar and includes a cill course on the second floor, an eaves course, a cornice, and a blocking course. The windows on the first and second floors have architraves, with the first-floor windows having cornices and deep apron panels, while the second-floor windows have shallower apron panels.

The northeast entrance elevation has recessed entrances at the center for Nos 17 and 19, both with glazed timber doors. No 19 features a letterbox fanlight. There are pilasters and a cornice leading to the mutual close for No 21, which connects to Nos 23 and 25. The first and second floors have regular window arrangements, except for a bipartite window located on the outer right of the first floor.

The building predominantly has 12-pane timber sash and case windows on the first and second floors, although some are modern replacements. The roof is covered with grey slate, featuring stone skews, coped apex stacks, and circular cans. The interiors were not seen in 1998.