Most listings are in the $10's per square foot per year. The Middletown submarket is going through a a rise in rates. In the last 3 months, the median rate increased $17 per sqft per year.
In the last 90 days, 12 listings have been made available, which means new availabilities might be going fast. You'll want to be prepared to make an offer immediately. About 25% of the office spaces in the Middletown 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,000 sqft. Most properties in this region are around 2 stories. Most buildings in this area were built in 1987 and are Class B.