Compared to the rest of the Metropolitan Los Angeles market, the Glendora region has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 14 listings have been posted online, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About 7% of the available leases in the Glendora 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,000 sqft. Most properties in this area are close to 2 stories. Most buildings in this area were built in 1985 and are Class B.