Property law: Related topics - Security deposit + Blackacre + Lex loci rei sitae + Lateral and subjacent support + Riparian water rights

A security deposit is a sum of money held in trust either as an initial part-payment in a purchasing process (often used to prevent the seller selling an item to someone else during an agreed period of time while the buyer verifies the suitability of the item, or arranges finance) - also known as an earnest payment, or else, in the course of a rental agreement to ensure the property owner against default by the tenant and for the cost of repair in relation to any damage explicitly specified in the lease and that did in fact occur.

Blackacre, Whiteacre, Greenacre, Brownacre, and variations are the placeholder names used for fictitious estates in land.

The names are used by professors of law in common law jurisdictions, particularly in the area of real property and occasionally in contracts, to discuss the rights of various parties to a piece of land. A typical law school or bar exam question on real property might say:

Adam, owner of a fee simple in Blackacre, conveyed the property "to Bill for life, remainder to Charles, provided that if any person should consume alcohol on the property before the first born son of Charles turns twenty-one, then the property shall go to Dwight in fee simple." Assume that neither Bill, Charles, nor Dwight is an heir of Adam, and that Adam's only heir is his son, Edward. Discuss the ownership interests in Blackacre of Adam, Bill, Charles, Dwight and Edward.

Where more than one estate is needed to demonstrate a point – perhaps relating to a dispute over boundaries, easements or riparian rights – a second estate will usually be called Whiteacre, a third, Greenacre, and a fourth, Brownacre. 

Lex loci rei sitae (Latin for "law of the place where the property is situated"), or simply lex situs, is the doctrine that the law governing the transfer of title to property is dependent upon and varies with the location of the property, for the purposes of the conflict of laws. Conflict is the branch of public law regulating all lawsuits involving a "foreign" law element if a difference in result will occur, depending on which laws are applied.

Lateral and subjacent support, in the law of property, describes the right a landowner has to have that land physically supported in its natural state by both adjoining land and underground structures. If a neighbor's excavation or excessive extraction of underground liquid deposits (crude oil or aquifers) causes subsidence, such as by causing the landowner's land to cave in, the neighbor will be subject to strict liability in a tort action. The neighbor will also be strictly liable for damage to buildings on the landowner's property if the landowner can show that the weight of the buildings did not contribute to the collapse of the land. If the landowner is unable to make such a showing, the neighbor must be shown to have been negligent in order for the landowner to recover damages.

Riparian water rights (or simply riparian rights) is a system for allocating water among those who possess land along its path. It has its origins in English common law. Riparian water rights exist in many jurisdictions with a common law heritage, such as Canada, Australia, and states in the eastern United States.

Common land ownership can be organized into a partition unit, a corporation consisting of the landowners on the shore that formally owns the water area and determines its use.