@Aron1902 @Marty211
You guys, here is the whole boring discussion. It's complicated, that's for sure, and in your shoes I would hire a real estate attorney to interpret it. I don't host in New York so I haven't forced myself to read the whole thing.
However, here are a few facts:
You cannot rent out an entire apartment or home to visitors for less than 30 days, even if you own or live in the building.
You must be present during your guests' stay if it is for less than 30 days.
You may have up to two paying guests staying in your household for fewer than 30 days, only if every guest has free and unobstructed access to every room, and each exit within the apartment.
Internal doors cannot have key locks that allow guests to leave and lock their room behind them. All occupants need to maintain a common household, which means, among other things, that every member of the family and all guests have access to all parts of the dwelling unit. Internal doors with such key locks create barriers to escaping in an emergency and may result in the issuance of a temporary vacate order.
The New York State Multiple Dwelling Law: The definitions of "Class A" and "multiple dwelling" can be found in Sections 4-7 and 4-8 of Article 1 of the Multiple Dwelling Law. The law contains certain exemptions for rentals to a “boarder, roomer or lodger.”
https://www1.nyc.gov/assets/buildings/pdf/MultipleDwellingLaw.pdf