N.Y. Multiple Residence Law § 215

§ 215. Interior water-closets and bathrooms. 1. Except as otherwise\nprovided in this section, water-closets, bath and shower rooms may be\nventilated by windows or mechanically ventilated as prescribed in\nsection one hundred seventy-one.\n 2. In transiently occupied dwellings there shall be on each story at\nleast two water-closet compartments for the first twenty living rooms or\nfraction thereof and at least one additional water-closet compartment\nfor each additional fifteen living rooms or fraction thereof.\n a. The water-closet compartments on each story shall be accessible\nfrom every such living room on the story. Such water-closet compartments\nmay be placed in one or more general toilet rooms.\n b. Every water-closet compartment of a general toilet containing\nwater-closet compartments permitted under this subdivision shall have a\nwindow opening to the outer air of the dimensions, kind and location\nrequired in a living room of the same area by section one hundred three,\nor be provided with a system of mechanical ventilation as prescribed in\nsubdivision six of section one hundred seventy-one.\n