Most listings are in the $20's per square foot per year. The North Corona submarket is seeing a a boost in rates. In the last 3 months, the median rate increased $11 per sqft per year. That's a 67% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the North Corona region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 6 listings have been listed, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,900 sqft. Most buildings in this region are around 2 floors. Most buildings in this region were built in 2007 and are Class A.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Agriculture is the dominant industry in this area. Most of the folk of North Corona work from home. Commuting between 30 and 45 minutes a day is the norm for those who opt to reside in this part of town.