Compared to the rest of the San Diego market, the Oceanside region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 64 listings have come on the market, so you'll want to check back regularly for new listings. About 20% of the available leases in the Oceanside are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,220 sqft. Most properties in this area are close to 2 floors. Most buildings in this region were built in 1985 and are Class B.