The typical asking rate per listing is in the $20's per square foot per year. The Texas region is going through a an increase in rates. In the last 3 months, the median rate went up $24 per sqft per year.
In the last 90 days, 7929 listings have been posted online, so you'll want to check back regularly for new listings. About 68% of the listings in the Texas are subleases, so you might be able to find a shorter term or below market rent. 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 1,670 sqft. Most properties in this region are approximately 2 floors. Most buildings in this area were built in 1985 and are Class B.