The typical asking rate per listing is in the $20's per square foot per year. The DFW Metroplex submarket is going through a a rise in rates. In the last 3 months, the median rate rose $24 per sqft per year.
In the last 90 days, 3183 listings have come on the market, so you'll want to check back regularly for new listings. About 72% of the listings in the DFW Metroplex 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 available, 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 market are around 2 floors. Most buildings in this market were built in 1985 and are Class B.