The typical asking rate per listing is in the $40's per square foot per year. The Ontario region is going through a decrease in rates. In the last 3 months, the median rate fell $40 per sqft per year. That's a 48% decline in rent.
In the last 90 days, 24 listings have been posted online, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 4% of the available space in the Ontario are subleases, so you will probably have to focus your search on direct office leases. 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 1,300 sqft. Most buildings in this region are close to 2 stories. Most buildings in this area were built in 1986 and are Class A.