The typical asking rate per listing is in the $20's per square foot per year. The Orange submarket is experiencing a an increase in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 17% increase 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 discounted submarket.
In the last 90 days, 40 listings have come on the market, which means listings might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 3% of the listings in the Orange are subleases, so you will probably have to consider a longer term lease. 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 1,890 sqft. Most properties in this market are approximately 2 floors. Most buildings in this region were built in 1982 and are Class A.