Most listings are in the $80's per square foot per year. The Greenwich region is experiencing a a boost in rates. In the last 3 months, the median rate increased $86 per sqft per year.
Compared to the rest of the Fairfield market, the Greenwich submarket has greater rates, and you'll need to make a great offer to be in this hot region.
In the last 90 days, 36 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 58% of the available leases in the Greenwich are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,620 sqft. Most buildings in this area are approximately 3 floors. Most buildings in this area were built in 1972 and are Class A.