(31)"reconstruction of a building" includes -(a)the erection wholly or partially of a building after more than one-half of its cubical contents has been taken down or burnt down, or has fallen down, whether at one time or not;(b)the re-erection wholly or partially of any building of which an outer wall has been taken down or has burnt down or has fallen down to, or within ten feet of the ground adjoining the lowest storey of the building, and of any frame building which has so far been taken down or burnt down or has fallen down as to leave only the frame work of the lowest storey;(c)the conversion into a dwelling house or a place of public worship of any building not originally, constructed for human habitation or for public worship, as the case may be, or the conversion into more than one dwelling house of a building originally constructed as one dwelling house only or the conversion of a dwelling house into a factory;(d)the re-conversion into a dwelling house or place of public worship or a factory or any building which has been discontinued as, or appropriated for any purpose other than a dwelling house or of a place of public worship or a factory, as the case may be;
