Most Charedi Shuls even if larger are still usually Shteibels. It might be set up as a Non-Profit Corporation, but its still owned by the Rav.
I knew of an unfortuante situation of a Shteibel that when the Rav died, his heirs had decided to sell off the building and get the money. The people who davened there were upset as they had paid the expenses for the shul (including the mortgage) and were now left high and dry with nothing to show for it.