Civil Code (Cap. 16), article 410

410. (1) A dividing wall between courtyards, gardens, or fields, shall also be presumed to be common, in the absence of a mark or other proof to the contrary. (2) Where the wall separates courtyards, gardens or fields, placed the one at a higher level than the other, the part of the wall which, having regard to the lower tenement, exceeds the height respectively prescribed in article 408 is presumed to belong to the owner of the higher tenement. Repairs to common wall.