Most listings are in the $30's per square foot per year. The Rockville Centre region is seeing a a rise in rates. In the last 3 months, the median rate increased $37 per sqft per year.
In the last 90 days, 3 listings have been listed, which means new listings are probably going fast. You'll want to be prepared to make an offer immediately. About 33% of the listings in the Rockville Centre are subleases, so you might be able to find a shorter term or below market rent. 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 1,850 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this area were built in 1972 and are Class B.