23 Savile Row

Fortress House, built as government offices soon after World War II, was long used as the headquarters of English Heritage. When the organisation was relocated to new offices, a decision was taken to redevelop the site. There were last-ditch moves to retain the Portland-stone-clad building and convert it, possibly for hotel use. Prior to demolition, however, DP9 secured a certificate of immunity from listing. Westminster Council was prepared to permit demolition but stipulated that a replacement block should be of comparable height and bulk and clad in masonry, in keeping with the character of the Mayfair Conservation Area.

Designs for a new building were commissioned from Eric Parry, meeting the local authority's brief and adding to the amenities of the area. The stone-clad structure will contain some of the best office space in the West End, along with shops at street level. The original consent had a residential element but, with the approval of the planning authority, this was transferred to a site on Oxford Street. Construction of the scheme began in 2007.