For the purposes of this chapter, the following terms shall have the following meanings:
(a) “Structure” means a building used or intended to be used for human habitation. For purposes of this subdivision, a building includes, but is not limited to, a mobilehome or manufactured home. The board shall exclude from this definition building types that require no structural fire protection services beyond those provided to otherwise unimproved lands.
(b) “State responsibility area” means state responsibility area as defined in Section 4102.