Most listings are in the $10's per square foot per year. The Sullivan County submarket is going through a an increase in rates. In the last 3 months, the median rate increased $19 per sqft per year.
In the last 90 days, 13 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 92% of the listings in the Sullivan 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 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 860 sqft. Most buildings in this region are approximately 2 stories. Most buildings in this region were built in 1930 and are Class Class B.