Most listings are in the $20's per square foot per year. The Texas submarket is going through a a boost in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 3% rise in rent.
In the last 90 days, 7090 listings have come on the market, so you'll want to check back regularly for new listings. About 4% of the office spaces in the Texas are subleases, so you will probably have to focus your search on direct office leases. 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 2,020 sqft. Most buildings in this region are approximately 2 stories. Most buildings in this market were built in 1984 and are Class B.