On average, listings lease in the $20's per square foot per year. The Corona region is going through a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 12% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Corona region has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 44 listings have been made available, so you'll want to check back regularly for new listings. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,130 sqft. Most buildings in this region are close to 2 floors. Most buildings in this region were built in 2005 and are Class B.