75 & 77 Brook Street is a high quality, 11,000 sq ft, new-build office development, located within the Mayfair Conservation Area for the Grosvenor Estate. The street façade is constructed from self supporting handmade brickwork and portland stone with bronze detailing. As well as targeting BREEAM excellent, the building will also be one of the first buildings in the United Kingdom to meet the International WELL Building Standard which is a new international evidence-based system for measuring, certifying and monitoring the performance of building features that impact on the health and well-being on the building’s users.