Vanderbulge Mansion was the estate of Mr. Vanderbulge. There was a large number of art treasures located in the mansion, along with the Vanderbulge Star Sapphire, which was believed to be the world's largest sapphire.
Marvin White, Wendy Harris and Wonder Dog visited the mansion after receiving a message from Wonder Woman to check out the star sapphire, because she suspected it would be stolen by Doctor Hiram Gulliver. Surely enough, the misguided doctor did indeed arrive and steal the sapphire, which enraged the estate owner.
Little is known about the estate of Vanderbulge itself. It appeared to be a fairly old estate, probably built in the 18th or 19th century, perhaps earlier. Its' design is at least a bit old fashioned for a home in the 1970s.
There was a burglar alarm system, and a security cage that ensnared anyone trying to steal the sapphire. This system was designed by the estate owner himself. Gulliver triggered that security system when he stole the sapphire. It couldn't contain him however, as he had a ray gun which he used to blast through the steel bars. He then used his handheld minimizer on the guards and Vanderbulge himself, making a getaway.