Most listings are in the $30's per square foot per year. The Anaheim submarket is going through a an increase in rates. In the last 3 months, the median rate increased $8 per sqft per year. That's a 29% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Anaheim region has higher rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 81 listings have come on the market, so you'll want to check back regularly for new listings. About 4% of the office spaces in the Anaheim are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,710 sqft. Most buildings in this market are close to 2 floors. Most buildings in this market were built in 1983 and are Class B.