Buildings soon became more elaborate and in 1724 the Carpenters' Company of the City and County of Philadelphia was formed to help instruct builders. As in London, Georgian architecture soon became the popular design in Philadelphia. In 1730 statesman and businessman James Logan was one of the first in Philadelphia to build a country home outside the city. The mansion, which he called Stenton, was the first Queen Anne-style building in the Delaware Valley. One of the most ambitious Palladian structures of the time was the Christ Church. Christ Church was completed in 1744 with a steeple added in 1754. Starting in the 1730s construction began on the Georgian-style Pennsylvania State House, now known as Independence Hall. It was designed by Andrew Hamilton with construction supervised by Edmund Woolley.