Most listings are in the $20's per square foot per year. The San Luis Obispo submarket is seeing a a rise in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 15% increase in rent.
In the last 90 days, 56 listings have been listed, so you'll want to check back regularly for new listings. About 7% of the office spaces in the San Luis Obispo are subleases, so you will probably have to consider a longer term lease. 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 1,350 sqft. Most buildings in this area are around 2 floors. Most buildings in this area were built in 2000 and are Class A.