Most listings are in the $20's per square foot per year. The Temecula region is going through a a boost in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 4% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Temecula submarket has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 33 listings have come on the market, which means new availabilities might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 18% of the listings in the Temecula are subleases, so you might be able to find a shorter term or below market rent. 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 1,700 sqft. Most buildings in this region are approximately 2 stories. Most buildings in this area were built in 1991 and are Class B.