Main stair one is confronted with a long corridor that creates the spine of the house. This axis is meant to impress the visitor, leading one to believe that the house is much larger than it actually is, while also providing ample room to entertain.
The Architecture of Diplomacy: The British Ambassador's Residence in Washington. Above and in the first photo of this post you see images of the ambassador's private study which artfully bridges what was once the connection between the residence and the embassy.
American Masterpiece: The British Embassy.