The typical asking rate per listing is in the $30's per square foot per year. The Williamson County submarket is going through a a rise in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 8% rise in rent.
Compared to the rest of the Greater Austin market, the Williamson County submarket has more expensive rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 29 listings have come on the market, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 10% of the available space in the Williamson County 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 460 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this area were built in 2000 and are Class A.