Compared to the rest of the DFW Metroplex market, the Duncanville region has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 4 listings have been listed, which means new availabilities are probably going fast. You'll want to be prepared to make an offer immediately. About 25% of the available space in the Duncanville 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,400 sqft. Most buildings in this market are around 1 stories. Most buildings in this market were built in 1989 and are Class A.