Rear Premises Of The Adelphi Theatre

The rear premises of the Adelphi Theatre, located on Maiden Lane in Westminster, were originally built around 1635 as terrace houses. They were converted into offices, dressing rooms, and a stage door for the theatre. Nos. 18 and 19 were acquired by the theatre in 1834, and No. 20 was added in 1867. Between 1868 and 1869, all three buildings were refaced by Joseph Lavender as part of the theatre's renovations.

The buildings are faced with stucco and have a slate roof, standing four storeys tall. No. 18 features four windows, while Nos. 19 and 20 each have three windows. The channelled ground floor includes doorways, with two on the right side and one on the left. The furthest right doorway was the former Royal Entrance to the theatre, featuring a door with a semicircular fanlight set in an egg and dart enriched surround, adorned with a female head key, rosettes, and rinceaux ornamentation in the spandrels, along with the Royal Arms in a panel above. The other doors are square-headed, with panels above them flanked by consoles.

The upper floors have sash windows with architraves, featuring console bracketed pediments on the first floor and cornices on the second floor. The third floor has segmental-headed half dormers. Additional architectural details include a moulded cornice over the ground floor, sill bands, string courses, and a dentil cornice over the second floor.