The way the Org used to be this would be out of the question. The thought of using a "dedicated" building for some secular use would be tantamount to blasphemy. (And as far as I know, they still have 'dedication' ceremonies after they build these things. Which raises the question; if the building has been dedicated to God, how could they turn around and sell it? But I digress . . .)
I think Searcher has a good point also. When you open something up for the public, especially in Western land, you become liable to the various civil rights laws, some of which are anathema to the WT.
Bobcat