(1) A retirement home is permitted to conform to Sentence (2) provided,
(a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered,
(b) it is not more than 4 storeys in building height, and
(c) it has a building area not more than,
(i) 12 000 m2 if 1 storey in building height,
(ii) 6 000 m2 if 2 storeys in building height,
(iii) 4 000 m2 if 3 storeys in building height, or
(iv) 3 000 m2 if 4 storeys in building height.
(2) The building referred to in Sentence (1) is permitted to be of combustible construction or noncombustible construction used singly or in combination, and,
(a) floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h,
(b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 1 h, and
(c) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.