On average, listings lease in the $30's per square foot per year. The Garden City submarket is going through a decline in rates. In the last 3 months, the median rate decreased $11 per sqft per year. That's a 21% decrease in rent.
In the last 90 days, 4 listings have been listed, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 950% of the available leases in the Garden City are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,540 sqft. Most buildings in this market are around 3 stories. Most buildings in this area were built in 1969 and are Class B.