It's a gutted original, but there has been at least one addition to it at some point. The original house was a 30 X 30 two story, and at some point someone added another 18 X16 section, an 18 X 34 section, and the entire third floor. It has since been gutted again, but never finished.
The people that bought it wanted to make it into a B&B (which is what all those fuckers do with any nice house like this.) but they wanted to serve booze, but there was a zoning law that wouldn't allow it since it's a residential area. So instead of going "Oh well I guess we just won't serve the spirits." they abandoned it half-done and put it up for sale.
The entire exterior is done, but the interior is gutted and even had "Temp" stairs going up to the third floor. I've actually been in it once when they tried to auction it off, but no one bought it.