I think your responses have been the best ones and comments weren't aimed at you. In responding to your quesitons, the epson projector will throw a picture at 50 feet(which isn't far) but the christie projector i was looking at casted the same after buying an additional lense. If I had the additional cash, I'd buy christie projectors just for name sake. I got an email back from my friend and she said she's going to go shoot pictures for me so I'll get a better understanding of everything. The ones on that coldwellbanker site were taken by the realtor.
One thing you really, really need to find out from the real estate agent is what type of screens the theatre has. Once you have that information, then you can find out whether the existing screens will be compatible with the Epson projectors. Don't assume that they will be - this is information about which you need to be absolutely certain. And if the real estate agent doesn't have that information then you need to either run very fast, demand that they obtain it, or be willing to pay someone who knows about this stuff to go to the theatre and check out the existing equipment and advise you of any limitations it may impose.