Guide to the ADA Standards

Are accessible spaces required on all levels of a multi-level parking structure?

It depends. If a parking facility has entrances and exits on one level only, standard and van accessible spaces are required on that level so that they are on the shortest accessible route to the entrance/exit. However, where a parking facility has entrances/exits or direct connections to an adjacent building on multiple levels, standard accessible spaces must be dispersed among accessible entrances on different levels, but van spaces can be grouped on one level under all conditions (§208.3.1, Ex. 1).