Most listings are in the $10's per square foot per year. The DeSoto submarket is going through a an increase in rates. In the last 3 months, the median rate went up $14 per sqft per year.
Compared to the rest of the DFW Metroplex market, the DeSoto submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 16 listings have been made available, which means spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 38% of the available leases in the DeSoto are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,500 sqft. Most buildings in this market are approximately 1 stories. Most buildings in this market were built in 1985 and are Class B.