On average, listings lease in the $40's per square foot per year. The Garden City region is seeing a a rise in rates. In the last 3 months, the median rate rose $45 per sqft per year.
In the last 90 days, 4 listings have come on the market, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 1,200% of the available space in the Garden City 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 1,540 sqft. Most buildings in this area are around 3 floors. Most buildings in this area were built in 1969 and are Class B.