The typical asking rate per listing is in the $30's per square foot per year. The Brea submarket is experiencing a a rise in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 5% increase in rent.
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, 13 listings have come on the market, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 3,590 sqft, there are still 0 new availabilities below 2,000 sqft. Most properties in this market are close to 2 stories. Most buildings in this market were built in 1985 and are Class B.