Loose material appartement 514

Due to strong wind during the last 24 hours, a noise indicating loose material is being observed at appartement 514. I am observing this noise from appartement 509, just below 514. I have informed the guard but he informed me that the owner is not at home and that the the guard can not take action. Who is able to check this appartement to avoid more damage than necessary? Regards, Hans van Meeuwen, app. 509