On average, listings lease in the $20's per square foot per year. The DFW Metroplex submarket is seeing a a boost in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 6% increase in rent.
In the last 90 days, 3484 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 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 1,720 sqft. Most properties in this market are close to 2 stories. Most buildings in this region were built in 1985 and are Class B.