On average, listings lease in the $20's per square foot per year. The Temecula region is experiencing a an increase in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 15% 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, 80 listings have been listed, so you'll want to check back regularly for new listings. About 8% of the office spaces in the Temecula are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,070 sqft. Most properties in this market are close to 2 stories. Most buildings in this region were built in 1991 and are Class B.