Most listings are in the $10's per square foot per year. The Lebanon region is seeing a a rise in rates. In the last 3 months, the median rate went up $18 per sqft per year.
In the last 90 days, 5 listings have been posted online, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 40% of the office spaces in the Lebanon are subleases, so you might be able to snag a great spot on a short term. 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 1,900 sqft. Most buildings in this area were built in 1989 and are Class A.