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London developer Derwent has said it expects to award the deal for the next phase of its Baker Street office-led scheme in London’s Marylebone area next month.

Laing O’Rourke is close to completing work on 25 Baker Street with practical completion slated for the end of June with the developer now turning its attention to appointing a contractor on its 50 Baker Street project.

The 50 Baker Street job comprises three buildings – 38-52, 54-60 and 66-70 Baker Street – which Derwent bought four years ago totalling 122,300 sq ft. Under the new plans, the site will be expanded to 240,000 sq ft.

Mace, Multiplex and Skanska all returned bids for the job, designed by AHMM, at the end of last month and is thought to be worth around £150m.

A winner is due next month with Derwent promising a start on start in the first half of next year.

Under the new plans, the site will be expanded to 240,000 sq ft with a resolution to grant planning agreed with Westminster council last summer.

Derwent also said it was looking to appoint a winner on the refurbishment of Greencoat & Gordon House by the end of this year, with the work involving revamping a 108,000 sq ft former Victorian warehouse in Westminster.

The office scheme, which is worth between £50m and £100m, is being priced by Overbury, Faithdean and Collins Construction. The revamp, which has been designed by Squire & Partners, is also scheduled to start in the first half of next year.

Meanwhile, Erith has been appointed to start demolition and enabling works this summer at Derwent’s Holden House scheme on Oxford Street.

A main contractor winner on the job, estimated to be worth between £50m and £100m, is due in the next few weeks.

Designed by DSDHA, the work involves retaining the facade of the grade II-listed building as part of a 133,000 sq ft office and retail scheme.

The firm also said the Network building on Tottenham Court, which Kier is carrying out, is due to be finished by the end of the year.