Burnt Offerings (1976)

Karen Black, Oliver Reed, Bette Davis, Burgess Meredith
Directed By Dan Curtis
IMDB
I took a tour of the Dunsmuir-Hellman Historic Estate where this was filmed last weekend in Oakland California. The Mansion has been in films like this film Burnt Offerings and Phantasm.
I highly recommended taking one of their tours if you are ever in the area.
http://www.dunsmuir.org/
The Mansion Today: