The bonus room is for your free imagination. You can add it to the dollhouse anywhere you like and choose what the use of the bonus room should be. Maybe a garage, an extra room for friends, fitness room - your choice! Like the Dollhouse, the Bonus Room will fit all mini or micro furniture. Also fits perfectly fits size 1 and 2 bunnies and rabbits as well as Mini Bunnies, Parent Mice, Big Brother Mice and Big Sister Mice. Measures 11.5" L x 12" W. Bonus room is 12" tall to second level floor and 15" tall including second level railing.