The typical asking rate per listing is in the $20's per square foot per year. The Huntington Beach region is going through a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 3% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Huntington Beach submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 33 listings have been made available, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,420 sqft. Most buildings in this region are close to 2 stories. Most buildings in this area were built in 1981 and are Class B.