Fee simple is an estate in land in common law. It is the most common way real estate is owned in common law countries, and is ordinarily the most complete ownership interest that can be had in real property short of allodial title, which is often reserved for governments. Fee simple ownership represents absolute ownership of real property but it is limited by the four basic government powers of taxation, eminent domain, police power, and escheat and could also be limited by certain encumbrances or a condition in the deed. How ownership is limited by these government powers often involves the shift from allodial title to fee simple such as when uniting with other property owners acceding to property restrictions or municipal regulation.