Purchasing Used Greenhouse Questions?

[Becca]

Hi! I have found a local listing on Craigslist for a commercial greenhouse 20 x 30. I've been looking into greenhouses, but I just moved and wasn't planning on getting one until a year or two down the road, but I stumbled upon this one and I'd hate to loose out on a good deal. The listing is pretty non descriptive and I'm not sure what questions I should be asking. Can anyone help me? Here is the link Commercial Greenhouse.

I did send an inquiry asking about what material it is made of, age, and if the gas furnace is vented or non-vented. I just moved houses (upgraded house size and property size) and my brain is fried and I'm not sure what else I should be asking! TIA!