Most listings are in the $20's per square foot per year. The Monrovia region is seeing a decline in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 12% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Monrovia submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 24 listings have come on the market, which means new availabilities most likley are 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 consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 5,740 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are close to 2 stories. Most buildings in this area were built in 1982 and are Class B.