Party Walls — a wall that separates two adjoining buildings owned by different parties but is common to those buildings. Insurance issues arise when a party wall is damaged but only one of the two parties that own the wall is able or willing to pay for its repair. In such cases, a party wall provision, introduced in the 2010 edition of the businessowners policy (BOP), makes it clear that the insurer of the party that wants to fix the wall will pay the full value of the loss, subject to other policy provisions. The insurer may then attempt to subrogate against the owner or insurer of the premises on the other side of the wall.