Agree. Speculate that proper fire stopping may have been missing or impaired from years of renovations that contractors/owners did. Constant approval battle AOAO boards have in other buildings when owners want to 'improve' their unit and board says cannot do it because it violates some code. Ex: I found romex wires in units (high rise multifamily buildings require steel conduit, flex or solid). Ex: I found wood studs being installed, but code requires metal studs only. Related Ex: bathroom job cut out fire rated chase assembly, put in cement boards for tiles and backed with wood studs. Ex: cabinetry replaced with new assembly completely covering electric panels. One job couldn't even open electric panel underneath. Ex: improper dryer venting with extension cords. Done by licensed contractors because our board requires license copy and current proof of insurance. And people like me who say its wrong and report it get grilled by contractors and owners who think they know better.