On average, listings lease in the $20's per square foot per year. The Orange submarket is experiencing a decline in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 16% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Orange region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 64 listings have been listed, so you'll want to check back regularly for new listings. 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 1,890 sqft. Most properties in this region are around 2 floors. Most buildings in this area were built in 1981 and are Class B.