Most listings are in the $10's per square foot per year. The Nassau County submarket is going through a decline in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 19% decline in rent.
In the last 90 days, 7 listings have been listed, which means new availabilities are probably going fast. You'll want to be prepared to tour spaces as quick as possible. 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 2,400 sqft. Most buildings in this area are around 2 stories. Most buildings in this market were built in 2002 and are Class B.