The typical asking rate per listing is in the $30's per square foot per year. The Nanuet region is going through a a rise in rates. In the last 3 months, the median rate increased $31 per sqft per year.
In the last 90 days, 3 listings have been listed, which means 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 1,000 sqft. Most properties in this region are around 2 floors. Most buildings in this region were built in 1984 and are Class B.