31, 33, 37 High Street, Blairgowrie

31, 33, 37 High Street in Blairgowrie is a three-storey building with a basement, constructed in 1870 by Alex Johnstone of Dundee. It features a four-bay Mechanics Institute and Library with shops on the ground floor, while the upper floors were converted to flats around 1975. The building has a closing terrace to the southwest and is built of polished ashlar and rubble. It has a mutuled eaves cornice and a pyramidal roof. The doors and windows are four-centre-arched, set into similarly-arched vertical panels with pilaster-like strips, and have stepped raked cills. The hoodmoulds include block label stops, and the stone mullions have stop-chamfered arrises.

On the southeast elevation facing High Street, the central bay at ground level features a hoodmoulded doorway with a blind panel at the center, flanked by circular details enclosing a blind shield, and a deep-set two-leaf panelled timber door with a plate glass fanlight. To the left is a traditional shop front with a deep-set door, while the bay to the right mirrors this design. Each floor above has four bipartite windows, with a blind shield in a moulded panel between the floors at each bay, and small circular details above the second-floor windows.

The northeast elevation is asymmetrically fenestrated and has a dominant shouldered wallhead stack at the center. The windows are timber sash and case with plate glass glazing, and the roof is covered with grey slates. The ashlar stacks are coped, with the one to the southwest truncated.

Inside, there is a stone-flagged hall leading to a stairhall with a cantilevered dog-leg staircase. This staircase features decoratively-finialled square-section newel posts, barley twist cast-iron balusters, and some boarded dadoes. The interior also boasts fine decorative plasterwork and architraved doors with moulded panels. The basement below No 37 contains a partly blocked bakers oven.