The typical asking rate per listing is in the $10's per square foot per year. The Montclair submarket is experiencing a an increase in rates. In the last 3 months, the median rate increased $20 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the Montclair region has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 0 listings have been posted online, which means listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About Inf% of the available space in the Montclair are subleases, so you might be able to find a shorter term or below market rent. 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 1,030 sqft. Most buildings in this market were built in 1980 and are Class B.