Welcome to our consultation website for Astrea’s proposals to sensitively upgrade and refurbish two separate buildings at 50 Stratton Street and 50 Berkeley Street.

Astrea Asset Management are looking to bring forward a new set of proposals for the site which will see both buildings updated to provide high-quality modern office accommodation which is more sustainable, more energy efficient and enhances the wellness of their occupants. For more details on the proposals and the opportunity to leave feedback, please visit “The Proposals”.

Project Team

Astrea is responsible for managing the Berkeley Square Estate. Our generational investment strategy seeks to protect and promote the enduring qualities of Mayfair through considered asset management and the development of timeless buildings.

Stiff + Trevillion are a well-established West London architecture practice. We have a strong reputation for elegant and sophisticated architecture. Collaboration and listening are at the heart of the practice's ethos. From the development of the brief and initial scheme right through to the delivery of the project with the design team, we work together. A vibrant team of interior designers and furniture designers as well as architects and technicians are employed in the Studio, reflecting the work we do across the commercial, restaurant & retail and private residential sectors. We have extensive experience of working in Westminster and have a proven track record of producing thoughtfully designed projects in the borough. The Practice is RIBA accredited and we are active members of many industry bodies as well as supporters of the Stephen Lawrence Charitable Trust and the Architects Benevolent Society. Our work has been recognised with many industry awards.

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