On average, listings lease in the $40's per square foot per year. The Ontario submarket is seeing a an increase in rates. In the last 3 months, the median rate went up $44 per sqft per year.
In the last 90 days, 24 listings have been posted online, which means listings might be going fast. You'll want to be prepared to tour spaces as quick as possible. About 13% of the available leases in the Ontario 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 1,300 sqft. Most properties in this area are approximately 2 floors. Most buildings in this area were built in 1986 and are Class A.