Most listings are in the $30's per square foot per year. The Anaheim submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 7% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Anaheim region has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 35 listings have been listed, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 6% of the available leases 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 1,800 sqft. Most properties in this region are approximately 2 floors. Most buildings in this market were built in 1983 and are Class B.