The Grosvenor Estate, which owns the freehold of the site leased to the Americans in the Fifties has also expressed interest, as has Elliott Bernerd and Sir Stuart Lipton's Chelsfield Partners. Irish developers Ballymore, to whose site at Nine Elms the embassy plans to move, have made it known they would consider a land-swap deal. The Grosvenor Square location is said to be worth £500million, even in today's market, although much will depend on what uses Westminster council will approve.