The typical asking rate per listing is in the $20's per square foot per year. The Monrovia region is going through a decline in rates. In the last 3 months, the median rate decreased $8 per sqft per year. That's a 26% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Monrovia submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 26 listings have been made available, which means spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 4% of the available space in the Monrovia 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 6,150 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this region are approximately 2 floors. Most buildings in this region were built in 1982 and are Class B.