This is more, relevant information. It does not, however, change my advice. You NEED to either do a market survey or consider what you are NOW paying to be a rational benchmark and then match it. I do this right now on my 177 acres with two tenants (one with cattle, the other with the equine facilities). The only ag production I have is hay. I reserve one stall in a 16 stall barn. I maintain commercial insurance. And do many other “dances” to satisfy the Alphabet Soup in a generally “business friendly” state. These all mean things with I do my taxes.
You, in reality, are just another landlord renting a commercial space. If you want to have it considered a “business” so that you get some very substantial tax benefits then you will have act like it’s a business and do the things business’ do. That means market surveys to figure out what to charge, as well as proper insurance, meeting any local commercial requirements, etc. Fail to do this and the Tax Man will visit eventually and he will NOT be your friend when he gets there.
But, a question: have you ever run a business before? If so then you know what to do. If not then you might want to get some professional help (lawyer, accountant, County Extension Agent, etc.).
Best of luck as you go forward.
G.