Fraser Bond are the leading lettings and property management agents for 70-74 Great Portland Street - London W1W. 70-74 Great Portland Street is a mixed-use building in London W1. 2016 - Planning Permission for: Demolition of existing buildings with the exception of the front facade at first, second and third floor levels, excavation at rear lower ground floor level, and redevelopment behind retained front facade to provide a new building over basement, ground, first, second, third and new / replaced mansard roofs and replacement shopfronts to provide Class D1 (educational) floorspace at ground and lower.