Fraser Bond are the leading lettings and property management agents for 77 Mayfair - London W1K. 77 Mayfair is a new apartment building from 2016 on South Audley Street in Mayfair, London W1. 77 Mayfair comprises the design and construction to shell and core of seven exceptionally high quality apartments over seven storeys, and has 30,139 sq ft of space (excluding basement levels). The average size of an apartment is 4,000 sq ft. The building is a concrete frame with a triple basement containing car parking and leisure facilities. The building is clad in hand set Portland stone with bronze.