On average, listings lease in the $20's per square foot per year. The Tustin region is seeing a an increase in rates. In the last 3 months, the median rate increased $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 lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 34 listings have been posted online, which means leases most likley are going fast. 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.
Even though the median size is 2,770 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this market are around 2 floors. Most buildings in this area were built in 1981 and are Class B.