There is a common trick in California to sub rent the property: the installation of a storage. To add a storage in a house is not a problem, while it is located on a concrete slab complying the set backs. A storage can be bought at Home Depot, Sears, etc. and there is specialized people to ensamble the parts. In my country, it is very difficult to find such storages in the city, as the lots are too narrow, so my first impression was to think that the American storage was too much. But this is not, considering Americans use not only storages to keep furniture, old things, garden tools, etc, but they also use the garages as full storages.