Most listings are in the $20's per square foot per year. The New Braunfels region is going through a a boost in rates. In the last 3 months, the median rate rose $23 per sqft per year.
Compared to the rest of the Greater Austin market, the New Braunfels region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 10 listings have come on the market, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 120% of the office spaces in the New Braunfels 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 1,730 sqft. Most properties in this market are close to 1 stories. Most buildings in this region were built in 1988 and are Class A.