Construction firm Mace has been selected to lead the refurbishment, fit-out and rooftop extension of the former headquarters of .

Mace will overhaul 78 St James’s Street in London, UK, for Canadian investment company BentallGreenOak.

Designed by architectural firm Squire and Partners, the scheme will provide 110,000ft² of office space. It will also feature a pavilion extension and rear rooftop terraces with views across Westminster and Green Park.

The listed front section of the building, which was initially completed in 1840, will be transformed to provide a wellness suite, a business lounge and a multi-function room.

BentallGreenOak development director Alexander Morris said: “78 St James’s Street will be delivered into a core West End market where there has been little speculative development of late, particularly of buildings with large footplates. This will provide unrivalled amenities and an office environment in a truly unique and characterful setting, which surpasses the needs of the modern office occupier.â€

Mace commercial offices managing director Ged Simmonds said: “78 St James’s Street is a unique office building due to its Georgian heritage and listed design elements. We are excited to be part of this ambitious plan to bring the building back to life and are looking forward to working closely with the developers to deliver these outstanding new offices.â€

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Last month, Mace Interiors completed the fit-out for BMI Healthcare offices in Cannon Street, London.

BMI has moved from six floors of 3 Paris Garden, Southwark, London, to 30 Cannon Street, between St Pauls Cathedral and Bank Station, where all corporate departments are working together on one level, in more than 11,688ft² of space.