Most listings are in the $20's per square foot per year. The Fullerton region is seeing a a boost in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 7% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Fullerton submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 14 listings have been posted online, which means new availabilities might be going fast. You'll want to be prepared to tour spaces as quick as possible. About 7% of the office spaces in the Fullerton 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 2,030 sqft. Most buildings in this region are close to 2 floors. Most buildings in this area were built in 1975 and are Class B.