I owned a home for a few years with tall maple trees on the adjacent lots... so the gutters got filled with leaf debris that eventually became soil, with plants growing out of it. I wasn't able to get to the top roof level to clean out those eavestroughs. The vertical drains were completely clogged too and I was only able to pull out earth/plant material and rinse them a short distance up. I was thinking about guards but we had to sell before that. Good to know for the future though.
The worst thing the trees did -- and they must have been many decades old -- was collapse the original clay sewage piping with their roots, so the basement flooded resulting in one hell of a mess and expense. Loved having the trees nearby though, and some of the boughs overhung the property which was nice shade but they probably had a high risk of cracking off and downing power lines. It's another thing I'll consider when I next purchase a house, particularly if it's old (that one was nearing a century in age when we bought it, and the trees were a big draw, particularly the tall poplar in the back yard though our relationship with it became love-hate)
That said, to bring this back on-topic, I don't think there need be much worry about the Coppley buildings' gutters getting clogged. There are no trees nearby that would do it, and no apparent other sources of debris.
