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I found this note in the center of the hallway at my apartment building. Although I don't speak Spanish I was able to translate bits via Google's translation tool. From what I can see the poster was upset at the loud music from apartment 26. The two replies seem to be from the person in 26 who seems to be upset about the public nature of the notice.
Photo taken at 331 Keap Street on February 3rd, 2007.