Koti Residency or British Residency or "Hyderabad Residency" is an opulent mansion built by the British Resident of Hyderabad state, James Achilles Kirkpatrick during 1798–1805. The design is a palladian villa which is similar in same design to its near-contemporary in the United States, the White House. It is the subject of William Dalrymple's White Mughals. The house was designed by Lieutenant Samuel Russell of the Madras Engineers and construction began in 1803.
Possibly this was used in one of the Harry Potter movies as an interior. If not, it should have been. Also, to not have this as a grand hallway for an enormous castle of beauty would be a waste wouldn't it?