Compared to the rest of the Metropolitan Los Angeles market, the Whittier submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 5 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 600% of the office spaces in the Whittier are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 580 sqft. Most properties in this area are around 2 floors. Most buildings in this region were built in 1970 and are Class B.