On average, listings lease in the $20's per square foot per year. The Tustin submarket is seeing a a rise in rates. In the last 3 months, the median rate went up $2 per sqft per year. That's a 6% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Tustin submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 35 listings have been listed, which means spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,830 sqft. Most properties in this market are close to 2 stories. Most buildings in this region were built in 1982 and are Class B.