occupying vacant land for an extended period of time. Areas with high concentrations of squatters are sometimes thought of as informal settlements. Squatters face great instability due to their lack of title and governmental efforts at "blight removal". "Squatting" can result in "adverse possession", that in common law, is the process by which title to another's real property is acquired without compensation, by holding the property in a manner that conflicts with the true owner's rights for a specified period of time. Circumstances of the adverse possession determine the type of title acquired by the adverse possessor, which may be fee simple title, mineral rights, or another interest in real property. Examples of Component Rights This table breaks down some of the various rights involved in real property ownership. Several of these rights can be transferred between different parties through sale or trade. Third parties can obtain the rights to access and profit from several of the public use rights without the consent of the title owner. This is often the case with resource extraction companies such as mines. For example, a husband and wife can be owners (technically, title owners) of real property that is also encumbered by a mortgage and a mechanics lien. Their neighbor may have an easement for a utility line, and a license for entry and exit to a nearby plot of land. Airplanes have the right to fly through their airspace. Constitutionally, the state and federal governments always hold the right to condemnation, also called eminent domain, and the government at multiple levels retains various regulatory rights such as environmental regulation, zoning, and building code enforcement. See also List of real estate topics Property rights (economics) Real estate References Introduction to Property Rights: A Historical Perspective Introduction to Property Rights: A Historical Perspective Property law