Two schemes have also recently been started in London and the combined plans could lead to the construction of 1.6 million sq ft of space across the capital starting by the end of next year.

The company said: “In July we received a resolution to grant planning permission for further enhancements to our proposals at our 102,000 sq. ft. redevelopment of Marcol House, 289/295 Regent Street, W1, and at our residential scheme at 23/24 Newman Street, W1.

“Demolition commenced earlier this month and we are targeting practical completion in 2012.

“The 100 Bishopsgate Partnership, our joint venture with Brookfield Properties, has made good progress in preparing this major City development for a potential start date during 2011, subject to a variety of partner approvals.

“Detailed design and specification studies have identified project improvements which could allow an increase in lettable area up from 815,000 sq. ft. to approximately 860,000 sq. ft.

“We continue to prepare schemes at Oxford Street, Wigmore Street, Walmar House, Regent Street, all in W1 and Fetter Lane, EC4 for a potential start over the next two years.

“At Hanover Square, W1, discussions on our masterplan proposals continue with Crossrail and, having received a favourable response from a number of stakeholders to our design proposals, we anticipate submitting a planning application later in 2010.”