Most listings are in the $40's per square foot per year. The San Juan Capistrano region is experiencing a a boost in rates. In the last 3 months, the median rate went up $44 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the San Juan Capistrano submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 2 listings have come on the market, which means spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 400% of the available leases in the San Juan Capistrano 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,210 sqft. Most buildings in this area are around 2 floors. Most buildings in this market were built in 1989 and are Class B.