Most listings are in the $30's per square foot per year. The Covina region is experiencing a a rise in rates. In the last 3 months, the median rate increased $8 per sqft per year. That's a 26% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Covina submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 10 listings have been made available, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 2,440 sqft. Most properties in this region are approximately 2 floors. Most buildings in this market were built in 1981 and are Class B.