Developer Derwent is preparing to start its most ambitious London scheme to date – the redevelopment of the former Saatchi building at Charlotte Street.

Brookfield Multiplex will deliver the 380,000 sq ft mixed-use development in Fitzrovia, which is one of two major projects due to be started by June 2016.

The project start, which has been delayed for several months, will see the contractor deliver a part refurbishment and part new build.

A substantial proportion of the existing structures are being retained to reduce waste and carbon emissions and the construction programme.