Teebin, good point. I'd think anything from the Georgian period is fair game (it is my dream to live in an actual Georgian townhouse one day, by the way. But no authentic ones to be found here in Toronto).
Felipe, I've included a pic of the actual filming location I got from Google Streetview. The Universal version looks like an exact replica to me, except for the roof. They've added a sloping roof and visible chimneys.
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