Sunderland Corporation's massive post-war housing estate developments, such as Farringdon, Pennywell, Grindon, Hylton Red House, Hylton Castle, Thorney Close and Town End Farm, together with earlier developments, have all passed into the ownership of Gentoo (once caleed Sunderland Housing Group), a private company and a "Registered Social Landlord". Since the transfer in 2000 there have been a lot of improvements to the quality of social housing in the city.