According to Obadiah Blackhall, the mansion has been in his family for generations, dating back to long before the Great War, and is a "fine example of Victorian architecture". He intends to keep this tradition alive, staying in the estate until he dies or a swampfolk gets him.
The mansion opens up into a main lobby with a kitchen on the left. The kitchen has a counter against the wall, a refrigerator, a cabinet and door that leads back out to Point Lookout. There is a library on the right side of the hall where Obadiah sits. In the library, there is a staircase that ascends to the second floor. When in the main lobby, the last rooms at the end of the hall are a dining room on the right and a poll hall on the left. There is a stairway in the pool hall that leads down to the basement. The basement is a small concrete room decorated with swampfolk totems. There is headless creeper on a table that Obadiah uses for rituals.
Continuing down the hall from the main room is a stairway on the left (before the pool hall) which leads upstairs. The upstairs is a squared hallway with four bedrooms spread throughout as well as a bathroom. The first doorway on the right leads back to the library. The master bedroom is at the end of the hallway and has some wardrobes and a queen sized bed. There is also an Average locked safe in the wall.
There is a locked safe in the northern bedroom on the second floor that contains a fair amount of random loot. It may include ammunition, caps, a Stealth Boy, a double-barrel shotgun, and a lever-action rifle. Opening and looting this safe (or any of the other contents of the Manor) will not make Obadiah Blackhall hostile.
Very Easy locked footlocker in upstairs hall may contain another Stealth Boy.