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 the swampfolk get him.
The mansion opens up into a main room with a kitchen on the left and a library on the right where Obadiah sits. In the library is a staircase that ascends to the second floor which has some bedrooms, one with an Average locked safe. After entering the library, on the left is a hallway that leads to a basement where Obadiah performs ritual acts.
- The door to the basement does not appear unless the Lone Wanderer gives the Krivbeknih to Obadiah, and remains invisible on the map.
- Outside Blackhall are many dolls which signal swampfolk territory, although the only one in the house is already dead.
- This house may also be used as a place to live since all beds are able to be slept in and the player character can safely store things in the house's containers.
- The front door to Blackhall Manor is, from the outside, a set of double doors. However when inside the manor, it is just a single door leading back outside.
- In the kitchen, there appears to be a faucet on the counter, yet there is no sink.
- Blackhall Manor was called Whitehill at a stage of its development, based on the name of its .nif file.
- Just south of the manor toward Dove Delta, there is an obelisk with a plaque that reads: "Here marks the landing of Captain John Smith's shallop upon his discover of Point Lookout in 1612." Smith helped establish Jamestown, the first permanent English settlement in the Americas, in 1607 and explored areas of the east coast, including Point Lookout, Maryland.
- Opening and looting containers (like safes) will not make Obadiah Blackhall hostile.