Most listings are in the $30's per square foot per year. The Hempstead submarket is going through a decrease in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 2% decrease in rent.
In the last 90 days, 2 listings have been posted online, which means leases are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 350% of the available leases in the Hempstead are subleases, so you might be able to snag a great spot on a short term. 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 700 sqft. Most properties in this region are approximately 2 floors. Most buildings in this area were built in 1960 and are Class B.