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If you’ve been out and about in Manhattan over the past six weeks and you have eyes and ears, you know something’s happening — something worrisome.

The urban streetscape is ­degrading.

Take a walk down Broadway on the Upper West Side from the 100s to the 70s, as I did Sunday, and you’ll see it everywhere. It seems every barren storefront with a rental sign in the window has ­become impromptu outdoor housing for a homeless person.

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