Most listings are in the $20's per square foot per year. The Mount Kisco region is going through a an increase in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 3% increase in rent.
In the last 90 days, 2 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 4,300 sqft, there are still 0 listings below 2,000 sqft. Most buildings in this market were built in 1986 and are Class B.