50 Stratton Street and 50 Berkeley Street

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50 Stratton Street and 50 Berkeley Street Welcome Welcome to the virtual exhibition of Astrea’s proposals to sensitively upgrade and refurbish two separate buildings at 50 Stratton Street and 50 Berkeley Street. Proposed view of 50 Berkeley Street We hoped to be able to show you our proposals for the site at a public event but unfortunately due to the ongoing Coronavirus situation, this is not possible at the moment given both government advice and our commitment to community wellbeing. As a result, this consultation is taking place ‘at-a- distance’ – using a range of different feedback tools. We are committed to engaging widely and making sure everyone has an opportunity to have a say on the plans in a way that suits them. You can provide your feedback on the information set out in these boards by clicking on the ‘Feedback Form’ on the ‘Have Your Say’ section on our website. You can also provide your feedback via post. We are keen to understand the views of our neighbours and the local community before submitting a planning application to Westminster City Council. Proposed view of 50 Stratton Street Meet The Team Astrea Asset Management Stiff +Trevillion CBRE Stiff + Trevillion are a well-established West London architecture Astrea is responsible for managing the Berkeley Square Estate. Our practice. We have a strong reputation for elegant and sophisticated generational investment strategy seeks to protect and promote the architecture. Collaboration and listening are at the heart of the enduring qualities of Mayfair through considered asset management practice’s ethos. From the development of the brief and initial and the development of timeless buildings. 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. Kanda The Site Site history The site was originally part of the Gardens of Devonshire House, ALBEMARIE ST a grand London Mansion built in 1673 by John Berkeley (Baron Berkeley of Stratton) which continued up to Berkeley Square. The original Devonshire House was abandoned in the early Twentieth DOVER ST century and subsequently replaced by the modern-day commercial building of Devonshire House to the south. BERKELEY ST In 1926, the site of 50 Berkeley Street was first developed along with The Mayfair Hotel to the North, and the modern-day Lansdowne House. 50 Berkeley Street was built as an office building, but also housed car showrooms and was the Headquarters of the travel 50 BERKELEY STREET agent Thomas Cook, whilst 50 Stratton Street was redeveloped in the 1930s. 50 Berkeley Street was further extended in the 1950s, adding further floors and a new roof to the building. 50 Stratton Street was subsequently demolished and the current 50 STRATTON STREET office building was constructed in the late 1990s. At that time 50 CURZON ST BOLTON ST Berkeley Street underwent a substantial modernisation, with further STRATTON ST PICCADILY expansion to the upper floors. The site today Today, the site is a diverse mix of office and retail usage. Central London Plan showing site location The buildings form a whole city block, defined by Berkeley Street to the East, Stratton Street to the West and North, and Mayfair Place to the South. Whilst they are separate buildings, 50 Berkeley Street and 50 Stratton Street share a lightwell. Neither building is listed, and the neighbouring properties Devonshire House and no. 6 and no. 8 Stratton Street are Grade II Listed. The buildings are within the Mayfair Conservation Area and the area of the adopted Mayfair Neighbourhood Plan. The site - 1673 The site today Existing Issues There are a number of issues with the existing buildings which we are keen to address: The facades are tired and in need of The ground floor of 50 Stratton The entrances to both buildings are The roofscape is inconsistent with investment Street is inactive and the building relatively poor and do not reflect the the local area, and lacks any form of line features insets which facilitate quality of a prime Mayfair location urban greening rough sleeping The rooftop plant is at the end of The interior is not suited to modern The public realm around the site its serviceable life and in need of occupier needs with inefficient would benefit from an upgrade replacement floorplates, and a lack of cycle parking for office tenants 50 Berkeley Street -Existing Site Berkeley 50 Interior Facade Existing Roof 50 Stratton Street -Existing Stratton 50 Site Roof Levels Street Frontage Facade Bay Exterior + Facade Analysis Our Proposals Our proposals will see both buildings updated to provide Grade A modern office accommodation, which is more sustainable, more energy efficient and enhances the wellness of their occupants. The key changes we are looking to make include: Remodelling the roofs of both buildings to Replacing the outdated plant with new high- make them harmonious with the existing quality sustainble energy systems, improving building and the site context and provide energy-efficiency of the buildings external amenity space for office users Activating the frontages to Stratton Street by Enhancing the main entrances for both creating the opportunity for new retail or a buildings, befitting their prime Mayfair location café/restaurant Delivering more efficient and flexible office floor Improving end of trip facilities in the basement plates such as cycle parking, changing rooms and electric charging points for E-bikes and electric scooters Introducing significant urban greening at upper Refurbishing the buildings to achieve an levels which will significantly contribute to improved thermal performance biodiversity and the City Council’s Wild West End initiative Proposed façade and rooftop configuration, 50 Berkeley Street 50 Berkeley Street – Key Moves PROPOSALS 5.3 New Rooftop Massing and Terraces Our proposals would remove the existing mansard and pavilion style roof and replace these with office It is proposed to remove the existing mansard and pavilion style roof floors that will be more harmonious with the existing 4 to create new upper floors which will be morebuilding harmonious and thewith surrounding the context. The key moves existing building and the site context. will see: 1 Predominant roof and cornice lines are1. realignedPredominant with roof and cornice lines are realigned with Devonshire House. Devonshire House. 3 2. The main body of the building is extended by one floor to align 5 The main body of the building is extendedwith by the one adjacent floor contextto and improve the proportions of 50 2 Berkeley Street. align with the adjacent context and improve the proportions of 50 Berkeley Street. 3. A roof level will be added with the opportunity to create rooftop terraces and introduce urban greening. 2 4. The central plant area is set back to the core of the building, 3 A roof level will be added and set back, reducing its prominence and create perimeter terraces.reducing its impact on the surrounding townscape, although it is around 600mm higher. 5 The central plant area is set back to the5. coreThe fifthof the floor building, corner roof terraces are extended by a level to 4 align with adjacent context and to be accessible from the level 6 reducing it’s impact on the surrounding townscape. 1 office. The fifth floor corner roof terraces are extended by a level 5 In total, the changes will increase the height of the building by to align with adjacent context and to be600mm. accessible from the level 6 office. Example of accessible Existing Rood Massing and Design New Rooftop offices and terrace terrace at Devonshire House Existing Roof Massing and Design Example of accessible terrace at Devonshire House New Rooftop offices and terrace 39 PROPOSALS 50 Stratton Street – Key moves 5.7 Comparison Views from above PROPOSALSPROPOSALS Existing View Proposed View 5.3 Key Design Moves 5.3 Key Design Moves Our proposals for 50 Stratton Street would see the CAP OF ADJACENT PROPERTY CAP OF ADJACENT PROPERTY Combined with the rear extension and relocated core, this 1 Combinedremoval with the of rear the extension top andfour relocated floors core, thistheir replacement with 1 would permit deep and efficient floor plates as opposed to the would permit deep and efficient floor plates as opposed to the currentfive constrained replacement layout under floors the Mansard which Roof. will deliver the following: current constrained layout under the Mansard Roof. The deeper floor plates allow an extra floor of office usage to be 2 The deeper floor plates allow an extra floor of office usage to be 2 added1. Betterto the building. proportioned and efficient commercial floor plates as added to the building. 3 opposed to the current constrained layout which the building has 3 The new rooftop plant area can be correctly sized, as opposed 3 The newunder rooftop theplant Mansard area can be Roof.correctly sized, as opposed 3 to the current constrained plant pods. to the current constrained plant pods. New added office floor alleviates 2 08 2. The deeper floor plates improve the upper levels as the building Newawkward added interfaceoffice floor to adjoiningalleviates 2 The removal of the Mansard roof then permits a new roof 4 6 08 4 The removal of the Mansard roof then permits a new roof 4 awkward50 Berkeley interface Street to adjoining 6 4 designsets of stepped back terraces which are more harmonious with the 50 Berkeley Street design of stepped terraces which are more harmonious with the adjacent context of 50 Berkeley street and Devonshire House.
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