Westminster Bridge is a road and foot traffic bridge over the River Thames between Westminster on the north side and Lambeth on the south side, in London.The bridge is painted predominantly green, the same colour as the leather seats in the House of Commons which is on the side of the Palace of Westminster nearest the bridge. This is in contrast to Lambeth Bridge which is red, the same colour as the seats in the House of Lords and is on the opposite side of the Houses of Parliament.For over 600 years, the nearest bridge to London Bridge was at Kingston. A bridge at Westminster was proposed in 1664, but opposed by the Corporation of London and the watermen. Despite further opposition in 1722 and after a new timber bridge was built at Putney in 1729, the scheme received parliamentary approval in 1736. Financed by private capital, lotteries and grants, Westminster Bridge, designed by the Swiss architect Charles Labelye, was built between 1739-1750.The City of London responded to Westminster Bridge by removing the buildings on London Bridge and widening it in 1760-63. The City also commenced work on the Blackfriars Bridge, which opened in 1769. Other bridges from that time include Kew Bridge (1759), Battersea Bridge (1773), and Richmond Bridge (1777).