Most listings are in the $20's per square foot per year. The Danbury submarket is seeing a a rise in rates. In the last 3 months, the median rate rose $7 per sqft per year. That's a 33% rise in rent.
Compared to the rest of the Fairfield market, the Danbury submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 35 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,150 sqft. Most properties in this region are around 2 floors. Most buildings in this area were built in 1978 and are Class A.