In the last 90 days, 1 listings have been posted online, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. About 300% of the office spaces in the Clinton County are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most buildings in this area are close to 1 floors. Most buildings in this market were built in 1970.