Harcourt House was a palatial residence built in about 1722 by Thomas Archer on Cavendish Square.
The main structure was largely demolished in 1906 leaving only the southern wing on the corner with Margaret Street, now Flanders House.
The palladian residence Archer designed was the centre-piece of the east side of Cavendish Square, London for nearly two centuries.
[2] It was later the residence of William Cavendish-Scott-Bentinck, 5th Duke of Portland, Lord of the Manor of Marylebone, and John Campbell, 2nd Marquess of Breadalbane.
LaSalle Investment Management sold that building, occupying two thirds of the original site, to the Sunley Group in 2013.