Compared to the rest of the San Diego market, the San Marcos region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 31 listings have come on the market, 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 on the market, 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 properties in this market are approximately 2 floors. Most buildings in this area were built in 1984 and are Class B.