The typical asking rate per listing is in the $10's per square foot per year. The Santee region is going through a decrease in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 19% decline in rent.
Compared to the rest of the San Diego market, the Santee region has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 2 listings have been posted online, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 15,710 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this area are around 2 stories. Most buildings in this market were built in 1973 and are Class C.