On average, listings lease in the $50's per square foot per year. The Rollingwood submarket is going through a an increase in rates. In the last 3 months, the median rate went up $15 per sqft per year. That's a 42% increase in rent.
Compared to the rest of the Greater Austin market, the Rollingwood region has higher rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 1 listings have been made available, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the office spaces in the Rollingwood 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 200 sqft. Most properties in this market are around 2 floors. Most buildings in this market were built in 1984 and are Class A.