The typical asking rate per listing is 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 decreased $3 per sqft per year. That's a 10% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Lake Forest submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 29 listings have been posted online, which means spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 41% of the available leases in the Lake Forest 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,190 sqft. Most properties in this area are approximately 2 floors. Most buildings in this region were built in 1999 and are Class B.