The typical asking rate per listing is in the $30's per square foot per year. The Ontario submarket is seeing a a boost in rates. In the last 3 months, the median rate went up $2 per sqft per year. That's a 5% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Ontario submarket has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 71 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the available space in the Ontario are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 3,200 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this market are close to 2 stories. Most buildings in this area were built in 2001 and are Class A.