The typical asking rate per listing is in the $20's per square foot per year. The San Marcos submarket is seeing a a boost in rates. In the last 3 months, the median rate went up $25 per sqft per year.
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 discounted submarket.
In the last 90 days, 111 listings have come on the market, so you'll want to check back regularly for new listings. About 40% of the available leases in the San Marcos are subleases, so you might be able to snag a great spot on a short term. 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 2,220 sqft. Most properties in this region are close to 2 floors. Most buildings in this region were built in 1983 and are Class B.