Civil Code (Cap. 16), article 308

308. The things following are i mmovable by their nature: (a) lands and buildings; (b) springs of water; (c) conduits which serve for the conveyance of water in a tenement; (d) trees attached to the ground; (e) fruits of the earth or of trees, so long as they are not separated from the ground or plucked from the trees; (f) any movable thing annexed to a tenement permanently to remain incorporated therewith. Unless a different intention appears from the circumstances, such thing shall be deemed to be so annexed to a tenement if it is fastened thereto by any metal or cement, or if it is otherwise so affixed that it cannot be removed without being broken or damaged or without breaking or damaging the tenement. When certain things become movable.