On average, listings lease in the $20's per square foot per year. The Central Islip submarket is experiencing a an increase in rates. In the last 3 months, the median rate increased $25 per sqft per year.
In the last 90 days, 6 listings have come on the market, which means listings 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 1,740 sqft. Most buildings in this area are around 9 stories. Most buildings in this area were built in 2003.