RoL meaning in Real Estate ?

Right to light is a form of easement in English law that gives a long-standing owner of a building with windows a right to maintain an adequate level of illumination. The right was traditionally known in the Anglo-American common law as the doctrine of "ancient lights". It is also possible for a right to light to exist if granted expressly by deed, or granted implicitly, for example under the rule in Wheeldon v. Burrows (1879).

In England, the rights to ancient lights are most usually acquired under the Prescription Act 1832. In the American common law the doctrine died out during the 19th century, and is generally no longer recognized in the United States. Japanese law provides for a comparable concept known as nisshōken (literally "right to sunshine").