If this is an existing stack and has always been open vented, I strongly advise you leave it that way. Capping the stack with an AAV may cause more issues than it solves.
All the neighbours have AAV's? Even more reason to keep yours the way it is, the main shared drain needs to be vented by at least one open vented stack, if everyone else on the shared drain has an AAV then yours may be the only one venting the drain and unfortunately have missed the boat.
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