Back in June 2016 we informed you of the requirements concerning gender neutral restrooms (viewable here).
Now that the requirement is in full effect, we wanted to remind you of this.
Local Law 79 of 2016 required gender-neutral single-occupant restrooms in NYC. All existing single-occupant bathrooms were required to be available to all genders by January 1st, 2017.
No physical alteration is intended to be required for such restrooms, except updated signage.
Local Law 79 of 2016 included various amendments to the 2014 Administrative, Plumbing, and Building Codes. These changes were published as Update #17 which can be found here.