I needed one, but couldn't find one, so I built one. :)
Here is a parking garage for your town or city. The arms raise to allow entrance. The top part is faux so only the bottom floor is accessible but you get the look of a full parking garage without all the prims. (40 prims total, without cars.) The cars inside, you should be able to copy if you wish. You can find it where the industrial buildings are. Thanks for stopping by.