Eighty Grosvenor Street Mayfair W1K Timeline News and progress updates from Eighty Grosvenor Street new development in Mayfair W1K Post a new milestone Coming soon to Mayfair - 17,500 sq ft of brand new office space to let at 80 Grosvenor Street. Available in Q2 2021 through Bluebook. 22/01/2021 by Buildington New planning application submitted for: Demolition of all existing buildings and erection of the new building over basement, ground, and five upper storeys including a... 02/06/2014 by Buildington