Most listings are in the $30's per square foot per year. The Hempstead submarket is seeing a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 2% decline in rent.
In the last 90 days, 2 listings have been posted online, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 250% of the listings 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 posted, 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 market are around 2 floors. Most buildings in this region were built in 1960 and are Class B.