Most listings are in the $10's per square foot per year. The Sparks submarket is going through a a rise in rates. In the last 3 months, the median rate went up $6 per sqft per year. That's a 39% rise in rent.
In the last 90 days, 22 listings have been made available, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,870 sqft. Most properties in this area are approximately 1 floors. Most buildings in this market were built in 1981 and are Class B.