Compared to the rest of the Fairfield market, the Greenwich region has higher rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 36 listings have been listed, which means spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 6% of the available space in the Greenwich are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,000 sqft. Most properties in this region are approximately 3 stories. Most buildings in this area were built in 1972 and are Class A.