The typical asking rate per listing is in the $30's per square foot per year. The Oyster Bay region is going through a a rise in rates. In the last 3 months, the median rate rose $38 per sqft per year.
In the last 90 days, 1 listings have been made available, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 200% of the listings in the Oyster Bay are subleases, so you might be able to snag a great spot on a short term. 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 900 sqft. Most buildings in this area are approximately 3 floors. Most buildings in this region were built in 1945 and are Class A.