Sounds like a dream come true for the beekeeper. If he can't get rid of all of the hive,all that can be done is seal up better. I would put up a swarm trap to see if they will go in there.
The smelly sprays don't last long but the homeowner could apply frequently during swarm season. After 5 years, they have a good idea when to apply. J
The smelly sprays don't last long but the homeowner could apply frequently during swarm season. After 5 years, they have a good idea when to apply. J