You are assuming people are living there and maintaining it. Go into a Chicago suburb and you will see collapsed houses and overgrown streets and foundations. Even though there are a few people still living there they do not have the time or resources to take care of everything. Even things like theaters, why should the neighbors or the city care about cleaning an old abandoned arena? We have lots of overgrown disbanded sports arenas even today that gets covered in dirt and dust from just a few decades of disuse.
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