201 Bishopsgate and The Broadgate TowerEdit profile
201 Bishopsgate and The Broadgate Tower 201 Bishopsgate and The Broadgate Tower are the latest additions to the award winning Broadgate development in the City of London, The 2.3 acre site represents the northern boundary of Broadgate and is bordered by Primrose Street to the south, Norton Folgate to the east, Worship Street to the north and Broadwalk House and a railway signal box to the west. Connected by a public galleria, the two buildings provide potential occupiers with complementary options in regards to floor space; 201 Bishopsgate, a 12-storey structure facing Norton Folgate and Primrose Street, offers spacious floorplates with the flexibility to accommodate a wide variety of fit-out options, while the 35-storey Broadgate Tower, which lies on the western boundary of the site, presents more compact floorplates and stunning views of London. The simple parallelogram form of The Broadgate Tower creates a landmark for Broadgate, while adding to the emerging cluster of tall buildings within the City of London. The massing of the development was largely informed by two significant factors. Firstly, the site itself is newly created land, consisting of a raft that has been constructed over the rail tracks of Liverpool Street station. The structural complexities of the raft require that a “bridge` structural solution is adopted for the tower, with the loads distributed to the bearing portions of the raft through an A-Frame, which also forms the skeleton for the galleria. Secondly, the eastern portion of the site lies within the view corridor that protects views of St. Paul’s Cathedral from King Henry’s Mound, thus limiting the height of construction. Rather than designing a single low-rise building across the site in response to this constraint, the design team developed a solution wherein a separate tower building could be constructed on the western edge of the site, lying just outside the edge of the view corridor, and facilitating the inclusion of the public galleria without reducing the density of development. The vertical massing of The Broadgate Tower eventually enabled almost one third of the site to be dedicated to public space. The covered, sky-lit galleria that links the two buildings has been designed to host a range of retail facilities to attract office workers and visitors, and contributes to the already extensive amenities available at Broadgate. The space will also act as a pedestrian passageway to connect Broadgate and the major transportation hub of Liverpool Street station with the new Shoreditch High Street station and further future developments that are planned to the north of the site. A public plaza to the south of the galleria, landscaped with trees and vine covered walls, and offering additional retail space, reinforces the commitment of Broadgate’s owner and developer, British Land to providing appealing and vibrant public spaces for its occupiers and the general public. 201 Bishopsgate and The Broadgate Tower draw their visual strength from expressing their structural systems through stainless steel cladding while providing the highest transparency from within as well as from without by minimising reflective coatings and glass tinting in the floor-to-floor glass skin. The material palette of stainless steel and glass enlivens the facades with an ever-changing interplay of reflections, light and shadows. The exterior walls were designed to create a humane interior work environment with generous access to natural light and views. The juxtaposition of the structural elements with the vision glass and the 80mm deep blinds provides scale and depth to the facades. The connections and reveals between the glass and the structure are highly articulated and detailed, animating the skin with shadows, light and reflection that change during the course of the day. The geometry of the tower exterior wall is based on a six level module while the low-rise is organized on a three level module. This sequence scales the two buildings appropriately while engaging in a dialogue with the industrial language of the Worship Street bridge and Exchange House. The western bar of 201 Bishopsgate is aligned with the structural bearing line established by the raft and held by the A-Frame strut bases. The eastern bar incorporates a gently curved concave form, which emphasizes the southeast corner while at the same time providing a greater degree of interest to the Norton Folgate street frontage. This bar turns the corner to hold the Primrose Street edge, engaging with the pedestrian scale of the Broadwalk House arcade. As the first in a potential cluster of high-rise buildings on the north of the City fringe, the tower component creates an important addition to London’s skyline as well as a landmark for Broadgate. Flexible and efficient occupier space in both buildings, combined with high-calibre public spaces, offer a welcome expansion to the flourishing district and increase office density within walking distance of the key transportation hub of Liverpool Street station. The development marks a new era for Broadgate, providing an innovative and elegant response to complex site constraints while delivering buildings with an “Excellent BREEAM` rating that reflects the commitment of both client and architect to a sustainable and environmentally sound future.