On average, listings lease in the $30's per square foot per year. The Orange submarket is going through a decrease in rates. In the last 3 months, the median rate fell $0 per sqft per year. That's a 1% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Orange region has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 52 listings have been posted online, so you'll want to check back regularly for new listings. 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 1,830 sqft. Most buildings in this region are close to 2 floors. Most buildings in this area were built in 1982 and are Class B.