 
 <translate> To answer the above question, the relevant sentence is: Since 1955, it has been the official residence of the United States Ambassador to the Court of St. James's.
So, the final answer is Winfield House. <hau> Don amsa tambayar da ke sama, jumlar da ta dace ita ce: Tun 1955, ya kasance gidan zama na Ofishin Jakadancin Amurka a Kotun St. James. Don haka, amsar karshe ita ce Gidan Winfield. 