Most listings are in the $30's per square foot per year. The La Mirada region is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 2% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the La Mirada submarket has greater rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 5 listings have been made available, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 280 sqft. Most buildings in this area are approximately 1 stories. Most buildings in this market were built in 1988 and are Class A.