Most listings are in the $30's per square foot per year. The Wilton Center region is experiencing a an increase in rates. In the last 3 months, the median rate went up $32 per sqft per year.
Compared to the rest of the Fairfield market, the Wilton Center submarket 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 made available, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 150% of the available space in the Wilton Center 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 300 sqft. Most properties in this region are around 3 stories. Most buildings in this market were built in 1979 and are Class A.