From Muppetwikia.com
In the 2011 movie, The Muppets, Kermit the Frog looks after a mansion in Beverly Hills, California. Miss Piggy had it built in the hopes that they would live together and raise a family. According to The Muppets: The Movie Junior Novel, Kermit actually lives in a nearby pond, and just comes by once a week to check the mail and clean the pool filters.
A private residence in Encino, California served as the exterior of Kermit's mansion. For the interiors, the filmmakers used Greystone Mansion of Beverly Hills, built in 1928 as a gift from oil magnate Edward L. Doheny to his son's family (and later sold to the city of Beverly Hills in 1965).
I tried to find pictures but couldn't. There's a scene where some of the characters find Kermit a the house and convince him to get the gang back together again. Kermit sings to paintings of his friends down a hallway of wood-paneled walls and black and white tile floor that I KNOW was used in the show. I thought it was pretty cool.
