Compared to the rest of the Metropolitan Los Angeles market, the Pomona region has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 44 listings have come on the market, so you'll want to check back regularly for new listings. About 2% of the available leases in the Pomona are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 1,800 sqft. Most buildings in this area are around 2 floors. Most buildings in this area were built in 1985 and are Class B.