I feel like I saw that too, but don’t hold you’re breath if you think they’re installing central air. The sponsor outright said no that ain’t happening. I feel like that must be a mistake, or a catch all for something else. Or maybe HVAC for the basement? That could make sense.
As for the combo apartment, are you absolutely sure? That seems like a bizarre approach.
Oh, yes, there's no doubt that they're combining those apartments. They've been planning on it ever since the family in C63 took the buyout offer and left. I agree, it seems bizarre, but the opportunity to construct a three- or four-bedroom top-floor apartment must be irresistible to the landlord/sponsor.
I'm sure the new HVAC system doesn't involve central air—at least, not in the foreseeable future. That would mean heavy-duty construction in every single apartment to run ductwork. But, aside from AC, I have no idea what a big HVAC system in a big apartment complex would be for.
I'm a renter, but if I were an owner I'd ask about this, especially why they're doing it, and also whether it will have an impact on your maintenance. (They'll undoubtedly apply for major capital improvement rent increases for the tenants because of it.)