Most listings are in the $30's per square foot per year. The Anaheim submarket is going through a decline in rates. In the last 3 months, the median rate fell $4 per sqft per year. That's a 11% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Anaheim submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 46 listings have been posted online, so you'll want to check back regularly for new listings. About 7% of the listings 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 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 1,580 sqft. Most buildings in this market are around 2 stories. Most buildings in this region were built in 1983 and are Class B.