Thayer Street and Marylebone Lane

We were delighted to start work with The Howard de Walden Estate in 2017, to realise their aspirations for the redevelopment of an existing site they owned, and which spanned across 20-27 Thayer Street and 47-57 Marylebone Lane, with existing buildings joining the two streets. The site sits within the Harley Street Conservation Area which is a mix of privately owned terraced houses, offices and public buildings to the north boundary, and commercial offices and retail to the south.

Our client wanted to redevelop the site to create a single office building with retail accommodation at ground and basement levels and offices to occupy 1st to 4th levels. The offices should provide modern efficient and flexible workspace, designed to accommodate a single tenant for the whole or multiple tenants, on a floor-by-floor basis. The client also wanted to achieve:

• Improved retail frontage along both Marylebone Lane and Thayer Street, enhancing the Marylebone Lane retail offer, to encourage greater footfall along Thayer Street and to help connect the southern end of Marylebone High Street with Wigmore Street.
• Redevelopment as soon as vacant possession was achieved and to complete the development in the quickest, and most economic timescale.
• A BREEAM ‘Very Good’ rating for the Office use.
• A living roof and features to include as much biodiversity as possible i.e., bat boxes, log and sand piles and planted terraces to enhance wildlife green corridors.

Chapman Architects gained Planning Permission to demolish the existing buildings and construct a new building providing 18,000 sq. ft. of net office and 10,000 sq. ft. of retail accommodation in July 2019. The project team was re-mobilised in June 2020 and undertook a co-ordinated Stage 2 review which allowed the Estate the opportunity to review its aspirations and to reflect on changes to the market since the planning application.

Vacant possession was achieved in the middle of 2021 and demolition commenced shortly afterwards.

Visualisation by Arko.