On average, listings lease in the $20's per square foot per year. The Castle Hills submarket is going through a a boost in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 10% increase in rent.
Compared to the rest of the Greater Austin market, the Castle Hills region has greater rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 19 listings have been listed, which means new listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 240 sqft. Most buildings in this region are approximately 4 stories. Most buildings in this area were built in 1982 and are Class B.