Hercule Poirot's Apartment

Florin Court is an Art Deco residential building, situated on the eastern side of Charterhouse Square in Smithfield, London, England. Built in 1936 by Guy Morgan and Partners, it became Whitehaven Mansions, the fictional residence of Hercule Poirot, in the 1980s filming of the TV series based on Agatha Christie's novels. It features an impressive curved facade, a roof garden and a basement swimming pool.

http://en.wikipedia.org/wiki/Whitehaven_Mansions