How many parking spots have you planned for and have you considered the possibility of going up yet..?
Keep in mind a few things:-people coming in for tours would likely be using buses or cabs as you may recall from your own excursions to the various destinations on and off the Strip-the only people you really have to accommodate for would be the operators of the facility -training performers would likely need a couple dozen spots; these same spots would likely be vacant for the community programs after hours-as Dov posted earlier, going up is a "vernacular" of sorts in Vegas
Underground parking could be an option... could it not? It seems its the "innovative" thing to do in vegas now. Cosmo is one of the first to initiate underground parking on the strip. Others to follow...
...except for the fact that unlike the Cirque training facility, Cosmo happens to draw ~$120 million each quarter which would make underground "innovations" possible!