The typical asking rate per listing is in the $30's per square foot per year. The Whittier region is experiencing a a rise in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 14% increase 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 depreciated submarket.
In the last 90 days, 5 listings have been made available, which means office spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 40% of the available space 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 900 sqft. Most properties in this market are close to 2 floors. Most buildings in this market were built in 1974 and are Class B.