Most listings are in the $10's per square foot per year. The Coppell region is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 4% decline in rent.
Compared to the rest of the DFW Metroplex market, the Coppell region has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 5 listings have been made available, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 20% of the available leases in the Coppell 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 available, so finding a space for a small business might be tough.
Even though the median size is 24,000 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this region are around 1 stories. Most buildings in this area were built in 2001 and are Class B.