On average, listings lease in the $20's per square foot per year. The Lake Forest submarket is going through a decline in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 5% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Lake Forest region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 31 listings have been listed, which means office spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 3% of the available leases in the Lake Forest are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 3,410 sqft, there are still 0 listings below 2,000 sqft. Most properties in this region are approximately 2 floors. Most buildings in this market were built in 1999 and are Class B.