There is a reason why seemingly prime land near the urban core often remains undeveloped. Sometimes it is protected under conservation laws. Other times certain areas are so heavily regulated that they effectively are undevelopable due to the time and effort needed to get approvals, e.g. property in a FEMA floodplain. In the City of Dallas, there is a special area called “The Escarpment” that is especially challenging.
The first question that usually arises regarding the escarpment is: “Am I located in the Escarpment?” A definitive answer requires a geological investigation by a geotechnical engineer, but the City of Dallas provides a rough sketch in their “Application for Escarpment Development Permit” with a disclaimer that at least gives you a general idea.
The only way to definitively know whether or not your site is located in the escarpment or a geologically similar area (GSA), is to get a geotechnical investigation and topographic survey. The results of the geotechnical investigation will identify the escarpment line which “means that line formed by the intersection of the plane of the stratigraphic contact between the Austin chalk and the Eagle Ford shale formations and the surface of the land.” The topographic survey will give you the slopes of the escarpment face so that you can determine the entire width of the escarpment zone (no development allowed here) and extents of a GSA (special permit required for development).