To bcr229:
Thank you for the suggestion. I was finally able to find a document online from the county zoning but, unfortunately, definitions and ordinances are vague and don't give me any clear answer on this specific question. However, I definitely am now more aware of the consequences of non permitted use and procedures relating to termination of the permit!
To all:
It is apparent that the need to speak directly with the zoning dept. is required, which is what I shall do. I thought some internet sleuthing, of which inquiring on this forum was a part of, would lead me to a more definitive answer. I guess there really are still some things in life that you just can't Google the answer to!
What I do know is that 501(c)3 orgs can generate it's income via rental property and that, in brief, the income is not taxable for activities that are directly related to the purpose of the org's exemption and their mission and that these activities cannot be running regularly. They can run on a short term basis only. So, I know that we obviously can't rent out to like a 31 Flavors or pizza place. The question that remains is what would we need to do in order to be in compliance with zoning for renting out our space. Perhaps we will have to upgrade the buildings to be coded for commercial usage. I'm not sure about that. But I am confident we can get questions answered from the Planning dept.
Thanks, everyone, for the input that was helpful.