The 21-storey structure, Hanover House, main and above, has been squeezed on to a small plot, part of the One Tower Bridge development. The slender tower’s hi-tech lift automatically recognises residents and delivers them to a private vestibule and their own wraparound lateral space. The lower levels have a single one-bedroom flat on each floor, while higher up are three duplexes and a spectacular triplex at the very top. Smart technology allows remote control of automated blinds and lighting. From £1.35 million to £8.5million. Call 020 7871 0011.