Compared to the rest of the Fairfield market, the Darien region has greater rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 8 listings have been posted online, which means new availabilities most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 50% of the listings in the Darien are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 3,220 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this area are around 2 floors. Most buildings in this region were built in 1980 and are Class A.