The typical asking rate per listing is in the $20's per square foot per year. The Oceanside submarket is seeing a decline in rates. In the last 3 months, the median rate decreased $6 per sqft per year. That's a 20% decrease in rent.
Compared to the rest of the San Diego market, the Oceanside region has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 30 listings have been posted online, which means listings most likley are leasing quickly. 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 1,941 sqft. Most properties in this region are close to 2 floors. Most buildings in this market were built in 1984 and are Class B.