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Why can land and permanent buildings be classified as real property?

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Oil portrait of Hugo de Groot, also known as Hugo Grotius, by the workshop of Michiel Janszoon van Mierevelt, showing him with a ruffled white collar and dark clothing. — Property law Portrait of Hugo de Groot (Hugo Grotius), oil on panel by the workshop of Michiel Janszoon van Mierevelt, 1631; in the Rijksmuseum, Amsterdam.

In English common law, the classification of land and permanent buildings as real property stems from the historical nature of legal remedies.12

Historically, interests in land were protected by "real" actions. These actions were considered "real" because the legal remedy sought was the specific recovery of the land itself, rather than mere monetary compensation. Because the law allowed for the actual restoration of the immovable property to the claimant, the interest in that property was categorized as "real".2

In contrast, movable objects were protected by "personal" actions, where the typical remedy was monetary damages rather than the recovery of the specific item. Consequently, while land and fixtures—such as permanent buildings—became known as real property, movable possessions were classified as personal property. While modern legal systems have evolved, this historical distinction between immovable and movable assets remains a foundational element of property law.213