Teesside the four independent unitary authority boroughs of Hartlepool, Stockton, Middlesbrough and Redcar and Cleveland (a renamed Langbaurgh). At this time they were returned to the counties of North Yorkshire and County Durham for ceremonial purposes, with Stockton-on-Tees becoming the only district in England split between two ceremonial counties. In 1998 the neighbouring Borough of Darlington also became an independent unitary authority and this along with the four former Cleveland boroughs form the sub-region of the Tees Valley which is used for statistical purposes and governmental organisation. The name Tees Valley is increasingly promoted for economic and cultural connections, though Teesside,
Teesside Development Corporation left a legacy of limited and "often inappropriate and threadbare development". The areas it regenerated are clearly marked by distinctive TDC statues. Teesside Development Corporation The Teesside Development Corporation was a government-backed development corporation that was established in 1987 to fund and manage regeneration projects in the former-county of Cleveland in North East England. The Teesside Development Corporation developed several schemes, many on former industrial land on both sides of the River Tees and around Hartlepool ranging from housing, commercial, light industrial and leisure projects. Its flagship developments included the Tees Barrage, Hartlepool Marina, Teesside Park and Teesdale Business Park.