Most listings are in the $20's per square foot per year. The Fountain Valley region is seeing a a rise in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 7% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Fountain Valley region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 29 listings have come on the market, which means leases might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,000 sqft. Most properties in this region are around 3 stories. Most buildings in this area were built in 1982 and are Class B.