The typical asking rate per listing is in the $30's per square foot per year. The Oyster Bay submarket is experiencing a a rise in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 8% increase in rent.
In the last 90 days, 4 listings have come on the market, which means new listings are probably going fast. You'll want to be prepared to make an offer immediately. 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 1,050 sqft. Most properties in this area are approximately 3 floors. Most buildings in this area were built in 1945 and are Class A.