Compared to the rest of the Metropolitan Los Angeles market, the Brea region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 15 listings have been posted online, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 7% of the available space in the Brea are subleases, so you will probably have to consider a longer term lease. 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 spaces below 2,000 sqft. Most buildings in this area are close to 2 stories. Most buildings in this region were built in 1985 and are Class B.