The price you paid is public record although at times can be misleading on commercial properties because sometimes some of the purchase price is allocated to personal property.
It sounds like the lender just might not be comfortable on how to value. I would tell them the price. Tell them how you have improved park. How you spent so much $ and now the park is stabilized and easy peasy.
I think telling them "no" will raise a red flag on their end. Especially since they aren't savvy enough to know they should be able to find this info out with a phone call.