St Cecilia's Hall, Niddry Street, Edinburgh

St Cecilia's Hall, located on Niddry Street in Edinburgh, is a Classical concert hall built in 1763 by Robert Mylne, with later extensions by John Thin in 1812 and predominantly by Ian Lindsay in the 1960s. This two-storey building sits on a prominent site and features five bays facing south towards the Cowgate. The western elevation, which faces Niddry Street, is constructed of ashlar stone with some raised margins, while the southern side is made of droved, coursed rubble with ashlar margins. The eastern side has glass and metal curtain walling with a stone base. Notable elements include a base course, band course, and blocking course on the south side, which has a central wallhead panel inscribed with "FREEMASONS HALL 1812."

The western elevation, which was the former entrance, features an off-centre advanced section with a dentilled pediment and three bays. The central entrance consists of a two-leaf timber door topped by a five-light fanlight and is flanked by asymmetrical harled bays. The upper storey on the south side has 6-over-9 pane timber sash and case windows, while some windows on the west side are blank. The roof is covered with grey slates.

Inside, as observed in 2007, the hall underwent a reconstruction in the 1960s to create an early elliptical concert hall. It features a moulded plaster cornice, a concave ceiling, and a central raised elliptical cupola. The entrance hall includes a pedimented, consoled timber doorpiece with a two-leaf timber panelled door, flagstones, a Roman Doric screen, and a double curved stair with fluted metal balusters and a timber handrail. The lower room has stone segmental arches, while other rooms are adorned with simple cornicing and two-leaf timber doors.