On average, listings lease in the $30's per square foot per year. The Oyster Bay region is going through a a boost in rates. In the last 3 months, the median rate increased $38 per sqft per year.
In the last 90 days, 1 listings have been posted online, which means office spaces 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 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 900 sqft. Most properties in this market are approximately 3 floors. Most buildings in this area were built in 1945 and are Class A.