145 Piccadilly was a large terraced townhouse on Piccadilly in the London district of Mayfair that was built in the late 18th century. It was the residence of Hamar Bass in the late 19th century and home to the Duke and Duchess of York (subsequently King George VI and Queen Elizabeth) and two young daughters, Princesses Elizabeth and Margaret, from 1926 to 1936. It was badly damaged in an air raid in 1940 and demolished in 1959.