Because the new owner will still keep renting the apartments, the buyer of a house may want to live in it, why would the owner not want the renter to know? because then the renter will make plans for their own life and they may move to a place that they can continue renting and the landlord wont be able to rent a place for sale to a new tennant or at least they wont be able to for full rent. The owner is trying to squeeze every last dollar from the tennant and the tennant will have to move on short notice. Legally it’s O.K. but the right thing to do would be to inform the tennant and allow them to make their own decision, stay till the last minute or find something more stable. I can’t entirely blame the landlord, that genius paid 525k for a place that likely rents for 2k and even if it sells for ask, it’s a 175k loss in 2 years, nice work. Desperation makes buttheads out of even good people. There are a couple of NOD’s on that street, kharma will have her way, my guess is that is one of them.