I always liked that house.
I saw it being featured in an episode of Columbo, featuring John Cassavettes, Blythe Danner (Gwyneth Paltrow’s mother) and Myrna Loy as guest stars. Another funny thing to recall about Benson was that it never stated where Benson, Governor Gatling, and the rest were but you could see in close ups of the house the tropical ferns and plants outside.
The Benson Governor’s mansion is in Pasadena, California at 1365 S. Oakland Avenue.
http://www.iamnotastalker.com/2008/11/11/the-benson-house/