On average, listings lease in the $20's per square foot per year. The Port Chester region is seeing a a rise in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 18% rise in rent.
In the last 90 days, 1 listings have been listed, which means new listings most likley are going fast. 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 570 sqft. Most buildings in this market are approximately 2 stories. Most buildings in this area were built in 1963 and are Class B.