The correct legal term is an easement or servitude. Usually they work quite well. The POCO would request an easement from owner A through owner A's building to owner B. If owner A won't cooperate POCO can decide not to supply power to either owner, that usually makes owner A very cooperative. Utility easements are usually much more flexible than access or right-of-way easements as the easement is usually for the benefit of the person granting the easement.
