Hilo bought the house on the Internet by selling the gold parts from the broken rant robots. He constructed a basement/labratory by cobbling the chunks of the obliteratron and the rants.
Hilo's Mansion is made of bricks from the outside. It is colored tan, pink, and brown, and has two aboveground floors.
Above ground floors
We've only seen the first floor of the aboveground floors. It has lots of books, a couch, and lots of mangos.
Hilo calls the basement/laboratory "downstairs." It has gray walls and floor, and many high-tech machines.
Izzy (formerly, deceased)
Uncle Trout (formerly)