Most listings are in the $10's per square foot per year. The Lebanon region is going through a an increase in rates. In the last 3 months, the median rate increased $17 per sqft per year.
In the last 90 days, 3 listings have been listed, which means spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 33% of the office spaces in the Lebanon 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 available, so finding a space for a small business might be tough.
Even though the median size is 3,090 sqft, there are still 0 leases below 2,000 sqft. Most properties in this market are close to 3 stories. Most buildings in this area were built in 1900 and are Class B.