sentences:  It is difficult to tell whether all of the clear area marked Grosvenor Basin on the 1850 map was actually water, but the size of the basin was described as "immense" in 1878.When the station was built around 1858, the Victoria Station and Pimlico Railway obtained an Act of Parliament which ratified an agreement between them and the Duke of Westminster, allowing the station to be built on the basin site, and a new towpath to be constructed between Ebury Bridge and Eccleston Bridge.The station opened on 1 October 1860.