The typical asking rate per listing is in the $20's per square foot per year. The DFW Metroplex region is seeing a an increase in rates. In the last 3 months, the median rate increased $0 per sqft per year. That's a 2% increase in rent.
In the last 90 days, 3183 listings have been made available, so you'll want to check back regularly for new listings. About 3% of the available space in the DFW Metroplex are subleases, so you will probably have to consider a longer term lease. 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 1,320 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this region were built in 1985 and are Class B.