Client received a New York State K-1 and a New York City K-1 (partnership). Client is not a resident of New York.

I'm having issues with the New York City K-1. I thought that a nonresident was not subject to NYC tax. However, the NYC K-1 is not only showing NYC source income, they are also showing NYC nonresident withholding.

My question, as a nonresident, is he subject to NYC tax and, if so, what form does it belong on (can't find where to input info). Also, does anyone know where to input the NYC nonresident withholding that shows on his NYC K-1.

Please note that he is a partner in a firm that has offices and income generated from NY and NYC.

Appreciate any help

Rick