Halsey Street lies over the tracks of the District Line.
The development of Chelsea Common and the Common Fields down to the King’s Road left a triangular wedge of fields and market gardens to the north-east of the Marlborough Tavern, between Brompton Road, Hans Square and Sloane Avenue.
It is probably from the Rev. John Halsey, one of the persons heir to a portion of land of which the street site forms part.
Houses were being built in Halsey Street by 1846, and the seal on the development of these fields and gardens was set by the building in 1859 of St Simon Zelotes Church to the highly individual designs of Joseph Peacock.
