The typical asking rate per listing is in the $20's per square foot per year. The Pomona submarket is seeing a a boost in rates. In the last 3 months, the median rate increased $29 per sqft per year.
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 depreciated region.
In the last 90 days, 16 listings have been listed, which means leases might be leasing quickly. You'll want to be prepared to make an offer immediately. About 125% of the available space in the Pomona are subleases, so you might be able to find a shorter term or below market rent. 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 830 sqft. Most properties in this area are around 2 floors. Most buildings in this region were built in 1983 and are Class B.