On average, listings lease in the $30's per square foot per year. The Tarrytown submarket is going through a an increase in rates. In the last 3 months, the median rate went up $6 per sqft per year. That's a 18% increase in rent.
In the last 90 days, 6 listings have been made available, which means new listings might be leasing quickly. You'll want to be prepared to make an offer immediately. 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 2,090 sqft. Most buildings in this market are approximately 6 floors. Most buildings in this region were built in 1965 and are Class B.