An update (I know @DennisD also wants to know about this one)… I’ve knocked on their door a few times, but either no one’s home or they don’t answer their door. I did find a fruit that a squirrel (presumably) carried into the alleyway to nibble, so I picked that up to photograph more closely. It had more seeds than I was expecting (9+):
I’ll keep trying their door until they answer, and will update when/if that ever happens.