What is the term for a man-made attachment to land that adds value?

The term that best describes a man-made attachment to land that adds value is "Property Improvement." Property improvements encompass any enhancements made to a property that increase its value or utility. This can include structures such as buildings, fences, and landscaping, all of which are intentionally added to the land to improve its functionality or aesthetic appeal.

"Enhancement," while it suggests an improvement, is more of a general term and does not specifically indicate a permanent addition to land.

"Fixture" refers to items that are attached to the property in a way that they are considered part of the real estate, but it does not encompass broader improvements beyond what is installed.

"Development" refers to the process of constructing buildings or making major changes to a property but does not specifically highlight the tangible additions made to land.

Thus, "Property Improvement" accurately captures the concept of man-made additions that enhance the value of land.