Most listings are in the $20's per square foot per year. The Round Rock submarket is experiencing a a boost in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 3% rise in rent.
Compared to the rest of the Greater Austin market, the Round Rock submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 8 listings have come on the market, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 38% of the available leases in the Round Rock are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 2,500 sqft. Most properties in this region are approximately 2 floors. Most buildings in this area were built in 2006 and are Class A.