Royal Opera Arcades (including No 24 Charles II Street and No 5B Pall Mall)

The Royal Opera Arcades, which includes No 24 Charles II Street and No 5B Pall Mall, is a shopping arcade built between 1816 and 1818 by John Nash and G.S. Repton. It is the remaining part of the renovation and completion of Novosielski's Haymarket Opera House. The structure is made of stucco-faced brick and features a slated and glazed lantern roof.

This arcade connects Charles II Street to Pall Mall and is recognized as the earliest London arcade modeled after the late 18th and early 19th-century Parisian "passages" and "galleries." The entrances on both Charles II Street and Pall Mall are one and a half storeys high, featuring archivolt arches with imposts and scroll keystones, and have moulded cornices beneath balustraded parapets, along with wrought iron gates.

Inside, the arcade consists of 18 square bays, each with a plain groin vault and a circular lantern light. The bays are divided by plain soffit arches that rise from plain shafted Doric pilasters. The east wall has become a blind arcade since the 1896 rebuilding of Her Majesty's Theatre, while the west side retains its original shop fronts, each with flat bowed windows and panelled and glazed doorways, typically positioned to the right under entablature fascias. Above each shop, there is a mezzanine floor featuring an archivolt arched tripartite lunette window in the tympanum of the vault. Additionally, iron-cased 19th-century lanterns are suspended between every two shops.

At the south end of the blind east arcade, an opening has been made for mid-20th-century shops that are in keeping with the original design. Although Nash and Repton's arcade was the first of its kind, the concept was not entirely new, as Thomas Leverton and John Fordyce had previously advocated for an arcade on the west side of Novosielski's theatre to enhance the overall design after Novosielski's death in 1795.