The representative of some or all of the owners of dwellinghouses in a multi-unit complex may bring a claim under this Act in respect of those dwellinghouses, and any common areas, as if those dwellinghouses and areas were a single dwellinghouse, and as if the representative were its owner, if—
(a) each owner has given the representative a written notice—
(i) authorising the representative to bring and resolve a claim; and
(ii) authorising invasive testing by an assessor relating to the owner's dwellinghouse; and
(b) the owners together own at least 75% of the dwellinghouses in the complex; and
(c) subsection (1), (2), or (3) (as the case requires) of section 22 has been complied with; and
(d) the representative (or, if the representative is a body corporate, an officer or member of the representative) attaches to the application for an assessor's report—
(i) a written notice authorising invasive testing by an assessor relating to any common areas in the complex; and
(ii) a statutory declaration that paragraphs (a) and (b), and subsection (1), (2), or (3) (as the case requires) of section 22, have been complied with.