Most listings are in the $20's per square foot per year. The Lake Forest region is going through a decrease in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 10% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Lake Forest region has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 29 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 38% of the office spaces in the Lake Forest 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,250 sqft. Most properties in this area are close to 2 floors. Most buildings in this area were built in 1999 and are Class B.