Most listings are in the $10's per square foot per year. The Round Rock submarket is going through a a boost in rates. In the last 3 months, the median rate went up $16 per sqft per year.
Compared to the rest of the Greater Austin market, the Round Rock region has less expensive rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 3 listings have been made available, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 300% of the office spaces in the Round Rock 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.
Even though the median size is 3,500 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this area are close to 2 floors. Most buildings in this market were built in 2001 and are Class B.