Most listings are in the $30's per square foot per year. The Aliso Viejo region is experiencing a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 3% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Aliso Viejo submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 11 listings have been made available, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 18% of the listings in the Aliso Viejo are subleases, so you might be able to snag a great spot on a short term. 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 1,460 sqft. Most properties in this region are close to 2 stories. Most buildings in this market were built in 1999 and are Class B.