On average, listings lease in the $30's per square foot per year. The Tarrytown region is seeing a a rise in rates. In the last 3 months, the median rate rose $6 per sqft per year. That's a 18% rise in rent.
In the last 90 days, 6 listings have come on the market, which means office spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, 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 properties in this market are close to 6 stories. Most buildings in this region were built in 1965 and are Class A.