Most listings are in the $80's per square foot per year. The Ontario submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $84 per sqft per year.
In the last 90 days, 24 listings have been posted online, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 38% of the available space in the Ontario 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.
Even though the median size is 11,340 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this area are around 2 stories. Most buildings in this market were built in 1986 and are Class A.