Compared to the rest of the Metropolitan Los Angeles market, the Fullerton region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 14 listings have been listed, which means new listings might be leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,500 sqft. Most properties in this area are around 2 floors. Most buildings in this area were built in 1974 and are Class B.