site to expand his business. In 1761 he leased at Soho, then just in Staffordshire, with a residence, Soho House, and a rolling mill. Soho House was at first occupied by Boulton relatives, and then by his first partner, John Fothergill. In 1766 Boulton required Fothergill to vacate Soho House, and lived there himself with his family. Both husband and wife died there, Anne Boulton of an apparent stroke in 1783 and her husband after a long illness in 1809. The at Soho included common land that Boulton enclosed, later decrying what he saw as the "idle beggarly" condition of the people who had used it. By 1765 his Soho Manufactory had been erected. The warehouse, or "principal building", had a Palladian front and 19 bays for loading and unloading, and had quarters for clerks and managers on the upper storeys. The structure was designed by local architect William Wyatt at a time when industrial buildings were commonly designed by engineers. Other buildings contained workshops. Boulton and Fothergill invested in the most advanced metalworking equipment, and the complex was admired as a modern industrial marvel. Although the cost of the principal building alone had been estimated at £2,000 (about £276,000 today); the final cost was five times that amount. The partnership spent over £20,000 in building and equipping the premises. The partners' means were not equal to the total costs, which were met only by heavy borrowing and by artful management of creditors. Among the products Boulton sought to make in his new facility were sterling silver plate for those able to afford it, and Sheffield plate, silver-plated copper, for those less well off. Boulton and his father had long made small silver items, but there is no record of large items in either silver or Sheffield plate being made in Birmingham before Boulton did so. To make items such as candlesticks more cheaply than the London competition, the firm made many items out of thin, die-stamped sections, which were shaped and joined together. One impediment to Boulton's work was the lack of an assay office in Birmingham. The silver toys long made by the family firm were generally too light to require assaying, but silver plate had to be sent over to the nearest assay office, at Chester, to be assayed and hallmarked, with the attendant risks of damage and loss. Alternatively they could be sent to London, but