On average, listings lease in the $10's per square foot per year. The Hemet region is going through a an increase in rates. In the last 3 months, the median rate went up $2 per sqft per year. That's a 15% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Hemet region has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 2 listings have come on the market, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 100% of the listings in the Hemet are subleases, so you might be able to snag a great spot on a short term. 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 460 sqft. Most buildings in this area are approximately 2 stories. Most buildings in this area were built in 2008 and are Class B.