The Waterside building in Harmondsworth, Greater London, is the international head office of British Airways; it also houses the operational head office of BA's parent company, International Airlines Group (IAG). The building and landscaping, which cost £200 million, is on Harmondsworth Moor, northwest of Heathrow Airport, between the M4 and the M25 motorways in the linear Colne Valley regional park. Waterside is on the western edge of Greater London, near West Drayton and Uxbridge, in the Borough of Hillingdon