In the last 90 days, 8 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 163% of the available leases in the Syosset are subleases, so you might be able to find a shorter term or below market rent. 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 2,120 sqft. Most buildings in this region are close to 2 floors. Most buildings in this area were built in 1976 and are Class C.