In 1845, spurred partly by the local vicar and partly by Thomas Cubitt, the builder and developer, whose yards were across the river in the still marshy and undeveloped area of Pimlico, a bill was submitted to Parliament to form a royal park of 320 acres. The Act was passed in 1846 and £200,000 was promised for the purchase of the land. The Commission for Improving the Metropolis acquired 320 acres of Battersea Fields, of which 198 acres became Battersea Park, opened in 1858, and the remainder was let on building leases.