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The act of changing a written contract when one of the parties can prove that the actual agreement was different than what's written down. The changes are usually made by a court when both parties overlooked a mistake in the document, or when one party has deceived the other.

A commercial real estate lease in which the tenant pays a fixed amount of rent per month or year, regardless of the landlord's operating costs, such as maintenance, taxes and insurance. A gross lease closely resembles the typical residential lease. The tenant may agree to a 'gross lease with stops,' meaning that the tenant will pitch in if the landlord's operating costs rise above a certain level. In real estate lingo, the point when the tenant starts to contribute is called the 'stop level,' because that's where the landlord's share of the costs stops.

A promise that pledges nothing, because it is vague or because the promisor can choose whether or not to honor it. Such promises are not legally binding. For example, if you get a new job and promise to work for three years, unless you resign sooner, you haven't made a valid contract and can resign or be fired at any time.

The component parts of a legal claim or cause of action. To win a lawsuit, a plaintiff must prove every element of a legal claim. For example, here are the elements of a breach of contract claim: There was a valid contract. The plaintiff performed as specified by the contract. The defendant failed to perform as specified by the contract. The plaintiff suffered an economic loss as a result of the defendant's breach of contract.

Land and the property permanently attached to it, such as buildings, houses, stationary mobile homes, fences and trees. In legalese, real estate is also called real property.

(1) A written agreement purchased from a bonding company that guarantees a person will properly carry out a specific act, such as managing funds, showing up in court, providing good title to a piece of real estate or completing a construction project. If the person who purchased the bond fails at his or her task, the bonding company will pay the aggrieved party an amount up to the value of the bond. (2) An interest-bearing document issued by a government or company as evidence of a debt. A bond provides pre-determined payments at a set date to the bond holder. Bonds may be 'registered' bonds, which provide payment to the bond holder whose name is recorded with the issuer and appears on the bond certificate, or 'bearer' bonds, which provide payments to whomever holds the bond in-hand.

A determination of the value of something, such as a house, jewelry or stock. A professional appraiser -- a qualified, disinterested expert -- makes an estimate by examining the property, and looking at the initial purchase price and comparing it with recent sales of similar property. Courts commonly order appraisals in probate, condemnation, bankruptcy or foreclosure proceedings in order to determine the fair market value of property. Banks and real estate companies use appraisals to ascertain the worth of real estate for lending purposes. And insurance companies require appraisals to determine the amount of damage done to covered property before settling insurance claims.

A nonrefundable fee charged by a landlord when a tenant moves in. The fee covers the cost of cleaning the rented premises after you move out, even if you leave the place spotless. Cleaning fees are illegal in some states and specifically allowed in others, but most state laws are silent on the issue. Landlords in every state are allowed to use the security deposit to clean a unit that is truly dirty.