The typical asking rate per listing is in the $20's per square foot per year. The Wilton Center submarket is going through a a boost in rates. In the last 3 months, the median rate increased $24 per sqft per year.
Compared to the rest of the Fairfield market, the Wilton Center region has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 3 listings have been listed, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,320 sqft. Most properties in this market are close to 3 stories. Most buildings in this market were built in 1979 and are Class A.