Most listings are in the $20's per square foot per year. The Santa Ana submarket is experiencing a a rise in rates. In the last 3 months, the median rate increased $29 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the Santa Ana region has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 146 listings have been posted online, so you'll want to check back regularly for new listings. About 38% of the available leases in the Santa Ana are subleases, so you might be able to find a shorter term or below market rent. 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 2,320 sqft. Most buildings in this region are close to 2 floors. Most buildings in this region were built in 1981 and are Class B.