371. Party walls divided vertically.

In the rare case of a party wall in the second sense1 (that is, a wall divided vertically into two halves, each separately owned, neither owner having any easement2 over the other's half of the wall), neither owner is entitled at common law to support from the other. The right at common law for either owner to pull down that portion of the wall standing on his own land, even if sufficient support may not be left for the portion of the wall which belongs to his neighbour3, provided that the work is done reasonably and without negligence4, is