The typical asking rate per listing is in the $10's per square foot per year. The Tarrant County region is going through a decrease in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 9% decline in rent.
In the last 90 days, 426 listings have come on the market, so you'll want to check back regularly for new listings. About 3% of the available space in the Tarrant County are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,730 sqft. Most buildings in this area are close to 1 floors. Most buildings in this area were built in 1986 and are Class B.