On average, listings lease in the $30's per square foot per year. The Hempstead submarket is seeing a a rise in rates. In the last 3 months, the median rate rose $9 per sqft per year. That's a 34% increase in rent.
In the last 90 days, 2 listings have been made available, which means new availabilities most likley are leasing quickly. 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 800 sqft. Most properties in this region are approximately 4 floors. Most buildings in this area were built in 1960 and are Class B.