Developer鈥檚 proposals for RSHP-designed 99 Bishopsgate set to be among the largest office towers in the Square Mile

Brookfield Properties has submitted a full planning application for its proposals to build a 240m tall office building in the City of London鈥檚 eastern tower cluster.

Plans for the 54-storey 99 Bishopsgate scheme revealing new images of the RSHP-designed building were filed with the City of London Corporation earlier this week.

99 Bishopsgate sept 3

CGI of how the tower would look when built, with Stanhope鈥檚 AFK-designed 55 Bishopsgate to the right

The documents include a 57-page construction management plan drawn up by Brookfield subsidiary Multiplex, which is expected to be appointed as main contractor on the job.

The submission of plans is a significant step forward for one of the largest office schemes in the Square Mile, which is currently seeing a concentration of high rise commercial development set to transform the area around Bishopsgate and Gracechurch Street.

The tower would be located on a prominent corner site at the edge of the City鈥檚 main tower cluster and is described in planning documents as a 鈥渢ransitional鈥� building aiming to blend the architectural styles of nearby skyscrapers with more traditional buildings to the north.

Its proposed bronze-coloured facade is intended to reflect the mainly brick buildings of the neighbouring conservation area, while its lower levels have been designed to increase public access and permeability with a series of large open public spaces.

The site is currently occupied by a 28-storey tower built in the 1970s which serves as the UK headquarters of Multiplex. This would be demolished to street level from early 2026 with construction of the replacement tower starting at the beginning of 2028 and completing in the third quarter of 2030.

The design of the building has been heavily influenced by plans to save embodied carbon by retaining the existing building鈥檚 2.5m thick concrete foundation raft.

Because this underground structure is not strong enough to bear the weight of the new scheme, the new tower will be supported by a diagrid structure, an external framework of diagonal steel ribs which will wrap around the existing concrete raft.

99 Bishopsgate sept 1

The tower would be located on a prominent corner site at the junction between Bishopsgate and Wormwood Street

This means the structural support of the building will be external, with a load bearing 鈥渟atellite鈥� core containing the main passenger lifts attached to the outside of the tower and a non-load bearing 鈥渟oft鈥� core in the centre of the tower containing life safety systems and goods lifts.

A standalone cultural building would also be built on the site intending to align with the Square Mile鈥檚 vision to become a seven-day-a-week 鈥榙estination city鈥�.

This six-storey block would likely contain a mix of cultural uses including a ground floor gallery, a multipurpose events hall and creative studios for podcast recording, rehearsals and video editing.

The site neighbours 55 Bishopsgate, a 270m-tower designed by AFK which was approved last summer and will be the City鈥檚 third tallest when built.

There is expected to be a significant period of overlap between the two projects, meaning two of the biggest schemes in the City will be under construction at the same time on adjacent sites.

The project team for 99 Bishopsgate includes T&T Alinea on costs, AKT II on structural engineering, Ramboll on MEP services, Atelier 10 on sustainability, Momentum on transport, GIA on sunlight and wind, Trium Environmental Consulting on environment and Andy Sturgeon as landscape architect.

Planning consultant DP9, communications consultant Kanda Consulting and heritage and townscape consultant The Townscape Consultancy are also on the team.

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