The typical asking rate per listing is in the $20's per square foot per year. The Nassau County region is experiencing a a rise in rates. In the last 3 months, the median rate rose $24 per sqft per year. That's a Inf% rise in rent.
In the last 90 days, 13 listings have been posted online, which means new availabilities might be going fast. You'll want to be prepared to make an offer immediately. About 8% of the available space in the Nassau County are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,588 sqft. Most buildings in this area are close to 2 stories. Most buildings in this market were built in 2000 and are Class B.