Compared to the rest of the Metropolitan Los Angeles market, the Brea submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 15 listings have been listed, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 33% of the office spaces in the Brea 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 26,010 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this region are close to 2 floors. Most buildings in this area were built in 1985 and are Class B.