On average, listings lease in the $20's per square foot per year. The Tustin submarket is going through a an increase in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 9% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Tustin region has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 27 listings have been made available, which means office spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,940 sqft. Most properties in this market are close to 2 stories. Most buildings in this area were built in 1981 and are Class B.