An Out-of-State Power of Attorney is Valid in New York

New York's General Obligations Law (GOL) §5-1512 provides that a power of attorney executed in another state is valid in New York as long as it is in compliance with the law of the state where it was executed.

Matter of Christina G. (Josephine K.)
http://www.courts.state.ny.us/reporter/3dseries/2015/2015_25083.htm