James VI and I made significant changes to the buildings, notably the construction in 1622 of a new Banqueting House built to a design by Inigo Jones to replace a series of previous banqueting houses dating from the time of Elizabeth I. Its decoration was finished in 1634 with the completion of a ceiling by Sir Peter Paul Rubens, commissioned by Charles I (who was to be executed in front of the building in 1649). By 1650 Whitehall Palace was the largest complex of secular buildings in England, with more than 1,500 rooms. Its layout was irregular, and its constituent parts were of many different sizes and in several different architectural styles, making it look more like a small town than a single building. The irregularity of the buildings was increased by the penchant of courtiers to build onto their assigned lodgings, either at their own expense or that of the King's. Sir Stephen Fox, Charles II's Clerk of the Green Cloth, obtained permission from the Office of Works in the 1660s to build additions to the three rooms he was assigned. By the time he was finished he had constructed a grand mansion with coach house, stables, and a view over the Thames, all within the palace network.