The typical asking rate per listing is in the $30's per square foot per year. The Anaheim region is going through a an increase in rates. In the last 3 months, the median rate rose $8 per sqft per year. That's a 29% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Anaheim submarket has more expensive rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 86 listings have come on the market, so you'll want to check back regularly for new listings. About 3% of the listings in the Anaheim are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,730 sqft. Most buildings in this region are around 2 floors. Most buildings in this region were built in 1983 and are Class B.