On average, listings lease in the $20's per square foot per year. The Newtown submarket is going through a a rise in rates. In the last 3 months, the median rate went up $24 per sqft per year.
Compared to the rest of the Fairfield market, the Newtown region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 2 listings have been posted online, which means new availabilities might be leasing quickly. You'll want to be prepared to make an offer immediately. About 150% of the available space in the Newtown 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 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 1,900 sqft. Most properties in this market are approximately 2 floors. Most buildings in this market were built in 1968 and are Class A.