The South Molton Triangle is a new redevelopment proposal by Grosvenor Britain and Ireland to transform a prime, but underutilised, Mayfair area into a high-end retail, office and leisure community. The scheme involves the adaptable re-use of existing listed buildings and includes two new office buildings carefully set behind existing and new facades. The site is bounded by Davies Street, Brook Street and South Molton Street and covers 2 acres within the Mayfair Conservation Area and is part of the Grosvenor Estate.

The South Molton Triangle is positioned in close proximity to Oxford Street and Bond Street and acts as a gateway into Mayfair from the north. It will be the arrival point from the new Elizabeth Line, bringing a huge number of additional visitors to the area.

The two new office buildings will provide approximately 150,000 sq. ft. of prime office space combined with 58,000 sq. ft. of new shops, restaurants and cafes. Both buildings are designed to meet BREEAM Outstanding and WELL Platinum standards, and achieve a 35% improvement over the current Part L requirements.

The development also includes: the conversion of four Grade II listed town houses facing Brook Street into a ‘boutique’ hotel with a destination restaurant and cellar and bar; the conversion of a row of listed Georgian buildings along South Molton Street, from office use back to residential use, providing both private and affordable housing within this scheme.

A new high quality public realm, including new paving and landscaping, will create a new unique identity for this area. The proposals include transforming Davies Mews into a new al-fresco dining space. South Molton Lane, currently an underused back street, will be transformed with new micro retail units providing active street frontage, and an emerging public art strategy, aimed at celebrating the River Tyburn that flows beneath, will be incorporated within the public spaces.

Hopkins Architects are working with historic buildings adviser Donald Insall Associates, with BDP advising on the public realm. Planning permission was granted in December 2020. 


  • Location London, United Kingdom
  • Value £500 million
  • Size 33,000m²
  • Client Grosvenor Estate
  • Year 2026