In the 1950s he was a partner with Jane Drew, Maxwell Fry and Lindsay Drake in Fry, Drew, Drake and Lasdun. His originality became more evident in his 'cluster blocks' in Bethnal Green. These were a response to the critique of much post-war development for creating an isolating environment and discouraging community. The cluster blocks grouped flats around a central tower, and tenants were intended to be able to pick out their own flats in the structure. The earlier blocks at Usk Street of 1954 were medium-sized, while the later block Keeling House is high-rise. Keeling House was sold to a private developer by the London Borough of Tower Hamlets, and is now a block of luxury flats. Lasdun made an excursion into private housing with his St James' Flats in 1958, the plan of which was partly derived from social housing models such as the Narkomfin Building.