The typical asking rate per listing is in the $20's per square foot per year. The Danbury submarket is going through a decline in rates. In the last 3 months, the median rate decreased $5 per sqft per year. That's a 17% decrease in rent.
Compared to the rest of the Fairfield market, the Danbury region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 40 listings have been made available, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. 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 2,460 sqft. Most properties in this market are around 2 stories. Most buildings in this region were built in 1980 and are Class A.