The typical asking rate per listing is in the $20's per square foot per year. The Tustin submarket is seeing a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 5% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Tustin submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 33 listings have been posted online, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,690 sqft. Most buildings in this area are close to 2 stories. Most buildings in this area were built in 1982 and are Class B.