On average, listings lease in the $30's per square foot per year. The Bellmore region is seeing a a boost in rates. In the last 3 months, the median rate increased $38 per sqft per year.
In the last 90 days, 1 listings have been listed, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 830 sqft. Most buildings in this market were built in 2001 and are Class C.