I agree with DSC's posts -- it may end up costing you some money depending just where the problem is, but the corporation would check it out first.
I would send a registered letter to both your property manager and your landlord simply stating that you and your SO do not and have not rented via AirB&B or other and that only you live there. You could add that the security guard spoke to your SO at the time of the noise complaint so you cannot understand where the Air B&B idea came from. I would ask them to cancel their first letterSorry, not trying to hijack this thread but I can't post elsewhere.
My property manager (I rent a condo) sent me and my landlord a letter accusing me of renting the unit out on AirBnB or a similar service. I have never done this so I know it's a false allegation. They claim that when attending a noise complaint that my significant other claimed she was renting it from AirBnB. I was there and that never occurred. I complained but they refuse to rescind the letter. Obviously it makes me look bad in front of my landlord and I'm worried about them trying to impose a fine or evict me. What should I do? I'm going to talk to the guy at the front desk who apparently made this report which seems out of character for him. Anything I can do beyond that?
Seriously, you must try and do so in a way that others find worth their time and energy.
Otherwise, sell and go to a building where people care about their investments and their homes.
I find the fact that management does not allow you to post notices anywhere -- seriously? -- particularly disturbing. This building is YOUR property, not management's. Have you read your Declaration/Rules/Bylaws? Isn't there a provision for notices? (Free kittens? Looking for a parking space? Whatever?) We allow "public" notices by residents on three boards: one in the gym, one in the laundry room and another in what we call the moving room.