Sugar Maple dying, suggestions needed

I have a good-sized (10" trunk 20-25' high) sugar maple next to the street in front of my house. Last year it was very thin, leaf-wise, and turned to fall color mid-August. By mid September it had dropped all its leaves, way earlier than other trees in my Zone 5 neighborhood.
This year its even thinner leaf-wise! I called the village (who maintains the trees in the parkway, the strip of grass next to the street) mid-June and they sent a guy out. He said: "Yep, you've got a problem, we're not sure what. We've scheduled a root inspection, it might be root-bound."
Well they never got to it (don't know if they will, long story), so in mid July I fertilized with Espoma Tree-Tone per instructions and have been watering regularly. No change, but I didn't expect it this year.
As of now the tree is 2/3 fall color and dropping leaves!
Could any of you give me any suggestions as to what to do or what might be wrong? It's next to a street, a driveway, and a sidewalk, maybe it's just not getting enough water? But other parkway trees are doing OK. We have clay soil, perhaps root-bound is the answer? There are no signs of insects or disease that I can see.
I plan on getting an arborist involved if today's call to the village bears no fruit, but I'd like to hear any opinions you might have.
Thanks,
Max
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<< I have a good-sized (10" trunk 20-25' high) sugar maple next to the street in front of my house. Last year it was very thin, leaf-wise, and turned to fall color mid-August. By mid September it had dropped all its leaves, way earlier than other trees in my Zone 5 neighborhood.
This year its even thinner leaf-wise! I called the village (who maintains the trees in the parkway, the strip of grass next to the street) mid-June and they sent a guy out. He said: "Yep, you've got a problem, we're not sure what. We've scheduled a root inspection, it might be root-bound." >>
Sugar maple is a very poor choice for that location. If I were running your village, I would cut the tree down (the wood is valuable) and replace it with something more suitable, like a linden. Otherwise it will probably continue to die a slow agonizing death. Iris, Central NY, Zone 5a, Sunset Zone 40 "If we see light at the end of the tunnel, It's the light of the oncoming train." Robert Lowell (1917-1977)
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