Grosvenor and Mitsui Fudosan UK, alongside construction partner Skanska, have marked a major construction milestone at South Molton, London, with the topping out of 56 Davies Street and 60 Brook Street, two new-build, best‑in‑class commercial buildings at the heart of the West End’s largest mixed‑use development.

Delivered through a joint venture between Grosvenor and Mitsui Fudosan UK, these buildings form the commercial centrepiece of South Molton, Grosvenor’s flagship £500 million investment in Mayfair. 

In addition to the new-build commercial element, the 370,000 sq. ft development will deliver new homes, including onsite affordable housing, retail, cafés, restaurants and community and leisure space, alongside greener and more inviting streets and public spaces. 

56 Davies Street (71,000 sq. ft) and 60 Brook Street (78,000 sq. ft) will deliver new prime office space into a highly supply-constrained market. Analysis published by the Westminster Property Association in December 2025 indicates that prime vacancy in the Central Activity Zone has fallen to around 0.8%, underlining the acute shortage of best-in-class offices. 

Set to become some of the world’s most attractive workspaces, 56 Davies Street and 60 Brook Street will feature a mix of new and existing façades in a design which integrates with Mayfair’s distinctive character.

At 56 Davies Street alone, 4,750 blocks of Portland stone totalling 550 tonnes have been carefully disassembled and are set to be reconditioned and reused, providing part of the new prime office with an attractive and historic stone exterior.  

As part of the wider development of South Molton, the UK’s first Oberoi hotel will be located at 40-46 Brook Street, with the Indian luxury hospitality group set to bring their iconic design, world-class service and attention to detail to the Mayfair area. 

Once complete, South Molton will support nearly 1,000 permanent roles, reinforcing Grosvenor’s long‑term commitment to investing in a vibrant, inclusive and resilient West End. The development project is scheduled for completion by the end of 2027.

Jamie Whitty-Lewis, Chief Executive, Grosvenor Property UK said: 

“Delivering two brand‑new offices in the heart of Mayfair is an incredibly rare and special opportunity. These world‑leading buildings will help to drive the long‑term economic competitiveness of central London, providing best‑in‑class workspace that enables the capital to compete globally for businesses, investment and talent.

“The exceptional quality of the design means these new spaces will sit comfortably within Mayfair’s historic streetscape. It reflects our approach to supporting economic vitality while conserving and enhancing the character that has made this part of London one of the world’s most sought‑after destinations.”

Takeshi Iwama, CEO, Mitsui Fudosan UK said: 

“The topping out of South Molton is a significant milestone in the delivery of this exceptional development and underlines the strength of our collaborative approach with Grosvenor on the project.  We are confident that, once complete, South Molton will not only be one of central London’s most important commercial workplaces but it will also provide significant benefits to the wider community in the area.”

Mitsui Fudosan entered the UK market in 1990.  As well as South Molton, the company is involved in the development of office buildings and large-scale redevelopment projects across London including Television Centre (TVC), EDGE Liverpool Street and the British Library extension.  In 2024, the company entered the logistics business as a new asset class in the UK.

Terry Muckian, Executive Vice President, at Skanska said: 

“Reaching topping out at South Molton is a significant delivery milestone for Skanska and a reflection of the strong collaboration across the project team. Constructing two high-quality commercial buildings in the heart of Mayfair requires careful planning, technical expertise and a consistent focus on execution. We are proud to be working with Grosvenor and Mitsui Fudosan UK to deliver office space of the highest standard, and to be playing our part in bringing this landmark development closer to completion.”

About Grosvenor: 

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Grosvenor is an international organisation whose activities span urban property, food and agtech, rural estate management, and support for philanthropic initiatives. With a 340-year track record, we are committed to delivering lasting commercial, social, and environmental benefits, meeting today’s needs while taking responsibility for those of future generations.  

Our UK property business supports around 1,000 businesses and thousands of residents and workers across London’s West End, while also investing in sustainable neighbourhoods in Liverpool and across England. As a company aligned with the 1.5°C climate target, we pioneer change and innovation in urban development, ensuring our places benefit both people and the planet in the long term. 

About Mitsui Fudosan

Mitsui Fudosan Group

Since its founding more than 80 years ago, the Mitsui Fudosan Group has embraced a host of challenges.  During Japan’s period of rapid economic growth, the company was involved in land reclamation projects and helped to support wider economic investment.   Mitsui Fudosan delivered Japan’s first skyscraper, the Kasumigaseki Building, in the 1960s.  

More recently, the company has focused on sectors including logistics, residential, retail, hotels & resorts, sports & entertainment and mixed-use schemes.   The company is renowned as a pioneer of innovative development and in recent years, has expanded its operations to include Life Sciences and related industries.  Mitsui Fudosan operates on a global scale across Asia, Australia, North America and the UK/Europe.

Mitsui Fudosan UK

Mitsui Fudosan UK is the UK subsidiary of Japan’s largest real estate company, Mitsui Fudosan Co., Ltd. which is headquartered in Tokyo and listed on Tokyo Stock Exchange.  Mitsui Fudosan UK is responsible for Mitsui Fudosan Group’s real estate investment and development activities in Europe.  Mitsui Fudosan established a London office in 1990.  Significant developments in the UK include:

•             British Library, King’s Cross

•             5 Hanover Square, Mayfair

•             1 Angel Court, City

•             Television Centre, White City

•             White City Place, White City

•             EDGE Liverpool Street, City

•             South Molton Triangle, Mayfair

•             Wilson’s Lane, Coventry

For further information on Mitsui Fudosan see: www.mitsuifudosan.co.uk/