Fraser Bond are the leading lettings and property management agents for Green Park Chambers - London W1J. Green Park Chambers is a Grade II listed building in Mayfair, London W1. The building is now part of the In & Out Hotel and Residences development. History The Victorian building in the Mayfair Conservation Area was designed by John G Finch Noyes . Previously home to Herrick Gallery. 2015 - planning permission for: Alterations and extensions to 90-93 Piccadilly and the demolition and reconstruction of 42 Half Moon Street, the excavation of three additional basement levels, use of part basement.