On average, listings lease in the $20's per square foot per year. The San Marcos submarket is seeing a decrease in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 3% decline in rent.
Compared to the rest of the San Diego market, the San Marcos submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 16 listings have been made available, which means listings are probably going fast. 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 1,200 sqft. Most properties in this region are close to 2 floors. Most buildings in this market were built in 1984 and are Class B.