Most listings are in the $20's per square foot per year. The Kingston region is going through a decrease in rates. In the last 3 months, the median rate fell $10 per sqft per year. That's a 32% decline in rent.
In the last 90 days, 6 listings have been posted online, which means new listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 183% of the available leases in the Kingston 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,940 sqft. Most properties in this region are close to 2 floors. Most buildings in this region were built in 1920 and are Class Class B.