Compared to the rest of the Metropolitan Los Angeles market, the Monrovia region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 5 listings have come on the market, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. 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 1,120 sqft. Most buildings in this region are close to 2 stories. Most buildings in this market were built in 1982 and are Class B.