The typical asking rate per listing is in the $20's per square foot per year. The Azusa region is going through a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 6% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Azusa region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 7 listings have been listed, which means office spaces might be going fast. You'll want to be prepared to make an offer immediately. 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 1,280 sqft. Most properties in this region are close to 2 floors. Most buildings in this region were built in 1987 and are Class C.