Thiells Real Estate Lawyer, New York

An extraordinary and unexpected natural event, such as a hurricane, tornado, earthquake or even the sudden death of a person. An act of God may be a defense against liability for injuries or damages. Under the law of contracts, an act of God often serves as a valid excuse if one of the parties to the contract is unable to fulfill his or her duties -- for instance, completing a construction project on time.

In a contract, a promise by one party not to hold the other party responsible if the other party carries out the contract in a way that causes damage to the first party. For example, many leases include a hold harmless clause in which the tenant agrees not to sue the landlord if the tenant is injured due to the landlord's failure to maintain the premises. In most states, these clauses are illegal in residential tenancies, but may be upheld in commercial settings.

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.

Printed or 'canned' sets of questions that one party in a lawsuit asks an opposing party. Form interratories cover the issues commonly encountered in the kind of lawsuit at hand. For example, lawyers' form books have sets of interrogatories designed for contract disputes, landlord-tenant cases and many others. Form interrogatories are often supplemented by questions written by the lawyers and designed for the particular issues in the case.

A home loan in which the lender gets a share of the equity of the home in exchange for providing a portion of the down payment. When the home is later sold, the lender is entitled to a portion of the proceeds.

A rental agreement or lease between a tenant and a new tenant (called a sublessee) who will either share the rental or take over from the first tenant. The sublessee pays rent directly to the tenant. The tenant is still completely responsible to the landlord for the rent and for any damage, including that caused by the sublessee. Most landlords prohibit subleases unless they have given prior written consent. Compare assignment.

To take effect, or to benefit someone. In property law, the term means 'to vest.' For example, Jim buys a beach house that includes the right to travel across the neighbor's property to get to the water. That right of way is said, cryptically, 'to inure to the benefit of Jim.'

The substitution of a new contract for an old one. A novation may change one of the parties to the contract or the duties that must be performed by the original parties.