Order reversed, without costs, and the order of the Appellate Term reinstated in the following memorandum: The evidence persuasively demonstrates, as a matter of law, that the alterations were sufficiently substantial to constitute a significant injury to the reversion, entitling appellant landlord to possession of the premises.

Concur: Chief Judge Breitel and Judges Jasen, Gabrielli, Jones, Wachtler and Rabin. Taking no part: Judge Stevens.