Compared to the rest of the Metropolitan Los Angeles market, the Brea region 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 come on the market, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 7% of the listings in the Brea 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.
Even though the median size is 3,130 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this region are approximately 2 stories. Most buildings in this area were built in 1985 and are Class B.