On average, listings lease in the $20's per square foot per year. The Temecula region is experiencing a a rise in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 3% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Temecula submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 81 listings have been listed, so you'll want to check back regularly for new listings. About 7% of the office spaces in the Temecula are subleases, so you will probably have to consider a longer term lease. 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 approximately 2 floors. Most buildings in this area were built in 1991 and are Class B.