The typical asking rate per listing is in the $20's per square foot per year. The Whittier region is going through a an increase in rates. In the last 3 months, the median rate went up $11 per sqft per year. That's a 61% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Whittier submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 5 listings have come on the market, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 100% of the office spaces in the Whittier 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 1,570 sqft. Most properties in this area are close to 2 floors. Most buildings in this region were built in 1970 and are Class B.