The typical asking rate per listing is in the $20's per square foot per year. The Harris County region is seeing a a rise in rates. In the last 3 months, the median rate went up $0 per sqft per year. That's a 1% rise in rent.
In the last 90 days, 3210 listings have been posted online, so you'll want to check back regularly for new listings. About 3% of the listings in the Harris County are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 1,446 sqft. Most properties in this area are around 3 floors. Most buildings in this area were built in 1982 and are Class B.