Do I need to give a forwarding address to my New York landlord at move-out?

Yes. Most New York statutes (and GOL 7-108(1-a)(e)) condition the deposit return on the tenant providing a forwarding address. Without it, the landlord can hold the deposit until contacted. Provide the forwarding address in writing (email or letter) on or before move-out, with a clear request for return of the deposit. Failure to provide the itemized statement within 14 days forfeits the landlord's right to retain any part of the deposit. The forwarding address is the address where the landlord must send the deposit and itemized statement; if the tenant changes it, the tenant should update the landlord.

Source: GOL 7-108(1-a)(e)