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) north with Carlton House, London (replaced by Nash's Carlton House Terrace (1827–1833)) to the south. At the northern end of Portland Place Nash designed Park Crescent, London (1812) & (1819–1821), this opens into Nash's Park Square, London (1823–24), this only has terraces on the east and west, the north opens into Regent's Park. The terraces that Nash designed around Regent's park though conforming to the earlier form of appearing as a single building, as developed by John Wood, the Elder, are unlike earlier examples set in gardens and are not orthogonal in their placing to each other. This was part