The typical asking rate per listing is in the $20's per square foot per year. The Cedar Hill submarket is going through a a rise in rates. In the last 3 months, the median rate increased $24 per sqft per year.
Compared to the rest of the DFW Metroplex market, the Cedar Hill region has less expensive rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 3 listings have been listed, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 1,890 sqft. Most properties in this market are around 1 floors. Most buildings in this area were built in 2007 and are Class B.