The typical asking rate per listing is in the $20's per square foot per year. The Whittier region is going through a a rise in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 3% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Whittier region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 60 listings have been listed, so you'll want to check back regularly for new listings. About 3% of the available leases in the Whittier are subleases, so you will probably have to focus your search on direct office leases. 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 1,480 sqft. Most properties in this area are close to 2 floors. Most buildings in this market were built in 1974 and are Class C.