This is a situation where the landlord doesn’t want you to know it, but the power is in *your *hands. Legally, your lease runs until September no matter who owns the building, but the landlord can get a better price for an unencumbered property, so you can ask (basically) “what’s it worth to you for me to be out before my lease is up?” and negotiate something that will offset at least some of the pain of having to find a new place at a higher cost.