The Sudbury Society was formed in 1973 after a successful campaign to save the town's corn exchange from developers. However, in protecting its ancient centre the town has not shut itself off from modern development. As the town has expanded (to a population in 2005 of 12,080) modern retail and industrial developments have been added on sites close to the centre and on the eastern edge at Chilton. The 18th and 19th century houses near the town centre have been added to by modern developments.