Most listings are in the $20's per square foot per year. The Mission Viejo submarket is experiencing a decline in rates. In the last 3 months, the median rate fell $19 per sqft per year. That's a 42% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Mission Viejo region has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 14 listings have been made available, which means new listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 136% of the available space in the Mission Viejo are subleases, so you might be able to find a shorter term or below market rent. 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 1,500 sqft. Most buildings in this area are approximately 2 stories. Most buildings in this area were built in 1988 and are Class B.