RCW 9A.48.010: Definitions.

(1) For the purpose of this chapter, unless the context indicates otherwise:

(a) "Building" has the definition in RCW 9A.04.110(5), and where a building consists of two or more units separately secured or occupied, each unit shall not be treated as a separate building;

(b) "Damages", in addition to its ordinary meaning, includes any charring, scorching, burning, or breaking, or agricultural or industrial sabotage, and shall include any diminution in the value of any property as a consequence of an act;

(c) "Property of another" means property in which the actor possesses anything less than exclusive ownership.

(2) To constitute arson it is not necessary that a person other than the actor has ownership in the building or structure damaged or set on fire.