Hi Cynthia - I would recommend hiring a local broker with national presence. Brokers typically have a list of tenants who are looking for a specific sq ft requirement.
I would keep in mind that national tenants usually ask for TI up front (tenant improvement monies) and likely some free rent. I've got a few ideas of which tenants might be interested in this type of a property and would be happy to recommend a local broker to help with this process. I personally have a client who might be interested in purchasing the building if you are willing to sell it.
Apr 19, 2017