The Millwall Dock was constructed by John Aird & Co. to a design by Sir John Fowler and opened in 1868. The dock is L-shaped, with an 'Outer Dock' running east-west, and an 'Inner Dock' running north from the eastern end. It originally contained around 36 acres (14 hectares) of water and had a 200 acre (81 hectare) estate. The western end of the Outer Dock was originally connected to the Thames at Millwall by an 80 ft (24 m) wide channel. Millwall Dock lies near the centre of the Isle of Dogs, just south of the now developed Canary Wharf commercial business area. Millwall Dock is a commercial business district that includes office towers housing small to medium sized technology, publishing, legal and financial services companies. Millwall Dock is also an area where several housing developments and apartment towers have been developed.