Great view from the bedroom window. Your gardens look so nice and neat, and I bet the kids love their fort! The yellow daylilies sure have a lot of carrying power. Are those Buttered Popcorn and Cheddar? Debra

No idea, I'm afraid. Does the noise bother you? Do you want them to stop making it? If that's the case, then go upstairs while the noise is happening and ask them nicely to please stop making it. Or only do it earlier in the day, or whatever solution will work for you. "I don't know what you are doing, but that noise I mentioned last week? It's happening now. Could you please figure out what is causing it and stop it? Thank you." Bear in mind that in some apartment buildings, noise travels strangely. What seems to be directly overhead might actually be on one side, or upstairs and over one unit, something like that. But if you go up while the noise is happening, you will be able to hear if it is coming from that unit or not. Or you could just live with it. Once I had upstairs neighbors who apparently dropped a bowling ball on their living room floor every night about 10 pm. Big thud of something falling, followed by a rolling noise. I never did figure out what it was, but it wasn't annoying enough to bother with trying to get it stopped.

Thanks for the reply. The fan is hung from a fan box which is supported by a 2 X 8 crosspiece screwed into the joists on either side. The ceiling plate, however, bears on the plaster via four rubber feet. I will balance the fan as carefully as I can but am still concerned about any vibration causing further damage. Thank you again J.G.

The leaves and branches seem to be alternate rather than opposite, so that would rule out both Viburnum and Weigela.