54, Mount Street, W1

No. 54 Mount Street is a town mansion built between 1896 and 1897 by architect Fairfax B. Wade for Lord Windsor, who later became the Earl of Plymouth. The building features thin red bricks, extensive stone dressings, and a Westmorland slate roof. It showcases an Arts and Crafts quality in its materials and detailing, combined with innovative Free Renaissance elements and hints of Grand Siècle classicism, all complemented by sumptuous formal interiors.

The mansion stands four storeys high, with a basement and dormered attics, and is six windows wide. The central section, which is slightly advanced, consists of four windows and is topped with a steep pediment. In front of this is a further two-window wide projection, finished with a bold curved pediment that bridges the basement area. The ground floor of this projection is faced in channelled ashlar and features a large semicircular arched doorway with ornate ironwork on the sidelights and fanlight. Above this, the stone-dressed archivolted sash windows have balustraded bowed balconettes, supported by Corinthian columns that carry the curved pediment with an oculus in the tympanum. The outer bays have garland-enriched heads above the ground floor architraved windows and architraved corniced casements on the first floor, with prominent aprons. The crowning pediment contains ornate stone garlanded oculi.

The Park Street return is flat and has similar window arrangements, finished with a large pediment framing three attic lunettes, their keystones linked by heavy ornate stone garlands. The rear of the building is similar but lacks a pediment, leading to a stone-flagged and balustraded formal terrace or court that sits over an extension of the basement, featuring archivolted and keyed windows. Ornate area railings enhance the exterior.

Inside, the lavish interior is planned around a raised-level hall with a divided staircase leading to a similar axial hall on the first floor. The interiors are sumptuously faced in marble in the Free Renaissance style, with a rich mixture of neo-Georgian and neo-Baroque elements in the reception rooms, all executed to a very high standard of Arts and Crafts workmanship.