On average, listings lease in the $10's per square foot per year. The Rosemont region is going through a a boost in rates. In the last 3 months, the median rate went up $20 per sqft per year.
Compared to the rest of the Greater Sacramento market, the Rosemont submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 14 listings have come on the market, which means new availabilities are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the office spaces in the Rosemont 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 1,980 sqft. Most properties in this area are around 1 floors. Most buildings in this market were built in 1985 and are Class C.