Work will start later this year after Westminster City Council granted planning approval to turn the prominent corner site into a “high-quality future-forward workplace.”

Architects Basha-Franklin have drawn-up designs for asset and development manager Morgan Capital to comprehensively refurbish the existing office through an innovative inside-out approach.

Proposals include a new entrance and reception at ground level, premium workspace and a reconfigured terrace on the seventh floor overlooking the square.

Sustainable, high-performance materials will be used throughout, while the building’s original materials will be reused and re-purposed.

The plans retain much of the existing structure, while considerable changes will be made inside and out.

Mace Interiors is main contractor on the job which is scheduled for completion by the end of 2024.

Alex Franklin, Director of Architecture at Basha-Franklin, said: “Our design recasts this prominent seven-storey building into something more contextual, giving it purpose and relevance while bringing greater harmony to Hanover Square.

“This is a future-forward building in every respect – from the super flexible interior layouts to technical innovation and our choice of newly emerging materials.”

Alex Morgan, Asset & Development Manager, Morgan Capital, said: “The proposals for 25 Hanover Square will restore the building’s relationship with the square while achieving the highest possible standards for design and sustainability.”