The typical asking rate per listing is in the $20's per square foot per year. The Pomona submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $5 per sqft per year. That's a 18% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Pomona submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 15 listings have come on the market, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 13% of the available leases in the Pomona 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 4,250 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this region are close to 2 stories. Most buildings in this area were built in 1983 and are Class B.