Dolphin Square is a block of private flats with some ground floor business units near the River Thames in Pimlico, Westminster, London built between 1935 and 1937. Until the building of Highbury Square, it was the most developed garden square in London built as private housing. At one time, it was home to more than 70 MPs and at least 10 Lords. At the time of its construction, its 1,250 upmarket flats were billed by Sir Nikolaus Pevsner as the "largest self-contained block of flats in Europe". To an extent, their design has been a model for later municipal developments.