Posting this for a friend--am hard pressed for an answer myself.
He just signed a lease for his rent-stabilized apartment, and an actual person did not sign the lease for the landlord. Instead it was just printed or hand-signed, "Gotham Management Corp." or whatever. Has been this way for a few years.
Have these been valid leases and, if not, can and should he contest it (get rent rollbacks etc.)?
I tend to think so but my diligent research has found nothing on-point.