From Muppet Wiki

Beauregard's Storing Room is featured in episode 503 of The Muppet Show. After Kermit charges Beauregard with "taking care" of the rats, Beau finds them trying to raid the refrigerator. Due to their small rat stature, they can't seem to get the door open. Taking advantage of the kindly janitor's lack of wit, Rizzo elects Beauregard as president of the rats. The president's first job in his new appointment is to declare the fridge "open."

The location appears as a property in the Monopoly: Muppets Edition game as "Beauregard's Supply Closet."

Sources

• "I hope you rats are making yourselves at home in my little storing room." -- Beauregard