Most listings are in the $20's per square foot per year. The Hauppauge submarket is going through a a rise in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 13% rise in rent.
In the last 90 days, 38 listings have been posted online, which means new availabilities are probably 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 1,990 sqft. Most buildings in this market are close to 1 stories. Most buildings in this area were built in 1986 and are Class B.