Most listings are 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 increased $16 per sqft per year.
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 depreciated submarket.
In the last 90 days, 2 listings have been listed, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 550% of the available leases 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,040 sqft. Most properties in this region are around 2 stories. Most buildings in this region were built in 2008 and are Class B.