The typical asking rate per listing is in the $30's per square foot per year. The Diamond Bar region is going through a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 7% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Diamond Bar region has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 4 listings have been listed, which means office spaces might be going fast. You'll want to be prepared to tour spaces as quick as possible. 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 13,000 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this area are close to 2 floors. Most buildings in this market were built in 1988 and are Class B.