On average, listings lease in the $20's per square foot per year. The Garden Grove submarket is going through a a boost 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 Garden Grove submarket has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 19 listings have been listed, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. 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 1,590 sqft. Most properties in this market are around 2 stories. Most buildings in this market were built in 1981 and are Class B.