Most listings are in the $30's per square foot per year. The Rockville Centre submarket is experiencing 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 posted online, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 33% of the available leases in the Rockville Centre are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,850 sqft. Most buildings in this area are around 2 floors. Most buildings in this market were built in 1972 and are Class B.