16, 18, 20 Marshall Street, Edinburgh

16, 18, and 20 Marshall Street in Edinburgh is a building originally constructed around 1765. It forms the southern arm of a large U-plan block with a central pend that makes up the west side of Nicolson Square. In 1877, the central section was removed, creating two L-plan units when Marshall Street was formed through the building, likely designed by D Cousin.

The building is four stories high with a basement. The southern façade features ten windows made of exposed rubble, while the eastern gable is stuccoed and has two windows. The ground floor includes a doorpiece with fluted Ionic pilasters and paired triple keyblocked windows, both adorned with pulvinated friezes. The crowsteps on the roof were added in 1877, replacing the original straight skews.

The original eastern section of the northern façade has three windows, while the 1877 frontage at the truncation of the main jamb is crowstepped and double gabled. The ground floor shops have stugged coursers and strap-worked windows above. There is a basement area on the southern side.

The roofs are slated, and the chimneyheads have been rebuilt in brick and stucco. Inside, the building features mid-18th century panelling and shouldered lintel chimneypieces. The staircase is located within the 1877 truncation of the main jamb.