103 Mount Street is a prominent Portland stone office building in the heart of London's Mayfair. Minutes from Berkeley Square and backing on to St George’s and Mount Street Gardens, the property was built in 1938. It was refurbished by Prudential in 2001 to a Grade A specification, resulting in modern floorplates flooded with natural light on the southern, western and northern elevations.

Mount Street has developed in recent years into one of London’s most exclusive retail streets, boasting luxury retailers such as Marc Jacobs, Christian Louboutin and Balenciaga. The Grosvenor Estate is in the process of transforming the street through investment and improvements in road layout, surfaces, landscaping and street furniture.

The building provides about 25,000 ft² of offices, currently fully let to a variety of tenants including prestigious private bank Allen & Company and asset managers Gruss and Liongate, with about 6,500 ft² of retail at ground and basement levels let to Celine.