On average, listings lease in the $10's per square foot per year. The Glendora submarket is experiencing a decline in rates. In the last 3 months, the median rate fell $10 per sqft per year. That's a 39% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Glendora submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 4 listings have been made available, which means office spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. 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 1,460 sqft. Most buildings in this area are close to 2 stories. Most buildings in this area were built in 1985 and are Class B.