Most listings are in the $30's per square foot per year. The El Cajon submarket is going through a a boost in rates. In the last 3 months, the median rate went up $13 per sqft per year. That's a 74% rise in rent.
Compared to the rest of the San Diego market, the El Cajon submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 16 listings have been posted online, which means leases might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 69% of the office spaces in the El Cajon are subleases, so you might be able to find a shorter term or below market rent. 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 1,490 sqft. Most buildings in this region are approximately 2 stories. Most buildings in this market were built in 1977 and are Class C.