do co op reno's involving removal of plaster walls down to studs require legal permits and co op approval? R co ops required by law to keep records?

I'm in a classic stereo noise battle with a new neighbor. All diplomatic avenues have been exhausted. The problem is that even at what would be considered low, reasonable levels, bass and other low frequencies are still enough to drive me crazy. The problem is exacerbated by the fact that I am in a studio; no other rooms to escape the sound and wait it out. Furthermore, my neighbor is a bona fide audiophile and his music is on every single day. Two tenants ago did a renovation. They removed all the plaster and lathe down to studs to include the wall dividing our apts. The wall is his living room, where his speakers are. If the renovation wasn't authorized and legal would the co op be responsible? I also learned that the apartment had an illegal washing machine installed which when used produces an incredible, deep, low, vibrational electric motor "hum" in my apartment. The super always does things illegally here "on the take."