Buckingham Palace forms the architectural core of the palace was built for the first Duke of Buckingham and Normanby in 1703 to the design of William Winde. The style chosen was of a large, three-floored central block with two smaller flanking service wings. Buckingham House was eventually sold by Buckingham's natural son, Sir Charles Sheffield, in 1761 to George III for £21,000. Sheffield's leasehold on the mulberry garden site, the freehold of which was still owned by the royal family, was due to expire in 1774. Under the new Crown ownership, the building was originally intended as a private retreat for King
John Nash (architect) of Regent's Park; as with other projects, he left its execution to one of his assistants, in this case James Morgan. The first phase of the Regent's Canal was completed in 1816 and finally completed in 1820. Together with Robert Smirke and Sir John Soane, he became an official architect to the Office of Works in 1813, (the appointment ended in 1832) at a salary of £500 per annum, following the death in September of that year of James Wyatt, this marked the high point in his professional life. As part of Nash's new position he was invited to advise