Abstract: An extendable and retractable building includes floor and roof assemblies, each having a number of components movable between respective stowed and extended positions. A support structure may be provided to couple the floor assembly and the roof assembly. A cable coupling a component of the floor assembly and a component of the roof assembly preferably extends through at least two pullies in order to at least partially balance the weights associated with the respective components of the floor and roof assemblies. In one embodiment, the floor and roof assemblies may each include first, second, and third sections. A first cable may be coupled with support beams associated with the second floor section and a support beam connected with the third roof section. A second cable may also be provided coupled with a support beam connected with a third floor section and a support beam connected with the second roof section.