What term is used for land that is undesirable for building purposes?

The term used for land that is undesirable for building purposes is "Marginal Land." This refers to land that has limitations making it unsuitable for certain types of development, such as poor soil quality, excessive slopes, flood risks, or environmental restrictions. Marginal land often requires significant investment to modify or improve it before it can be considered suitable for construction or agriculture. In contrast, the other options represent categories of land that are generally more desirable for development: "Prime Land" refers to high-quality areas that are ideal for building, "Urban Land" is typically used for heavily populated developments, and "Excess Land" usually pertains to surplus properties that are often developed but not categorized specifically based on their desirability for building.