The typical asking rate per listing is in the $30's per square foot per year. The Clinton region is going through a a boost in rates. In the last 3 months, the median rate went up $38 per sqft per year.
In the last 90 days, 2 listings have come on the market, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 200% of the listings in the Clinton are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,260 sqft. Most buildings in this area are approximately 1 floors. Most buildings in this market were built in 1900 and are Class B.