On average, listings lease in the $20's per square foot per year. The Ridgefield region 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 Ridgefield region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 3 listings have been listed, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 167% of the available leases in the Ridgefield 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 1,180 sqft. Most properties in this area are close to 3 floors. Most buildings in this market were built in 1986 and are Class A.