Fraser Bond are the leading lettings and property management agents for The Mayfair Town House - London W1J. The Mayfair Town House building in Mayfair, London W1. History Formerly The Green Park Hotel. 2019 - Construction completed. 2017 October - Planning application submitted for - Demolition including the existing fourth floor and roof above. External alterations including the erection of an extension within the existing rear terrace at third floor level of 8 Half Moon Street to create a two-storey extension at third and fourth floor levels; erection of a replacement fourth floor with an additional.