"Under legislation that Mayor Michael R. Bloomberg signed on Aug. 8, small restaurants and coffee shops with an occupancy of 30 people or fewer are allowed to provide patrons with one bathroom rather than two, as previously required — one for each sex. The changes also brought the city’s plumbing code in line with a health department code that allowed places with fewer than 20 seats to not provide patrons with any bathroom.
"To determine the precise number of restrooms a restaurant or cafe must have. ...
The answer depends not only on how many seats it has, or people it can hold, but also on when the building was built, when the restaurant opened, what its certificate of occupancy says and whether it underwent renovations and, if so, how extensive.
A building is subject to the law it was built under, and if a restaurant moves into an old restaurant space and does not change its bathroom fixtures, the old requirements apply.
The city also does not have just one building code; there is a 1938 code, a 1968 code and a 2008 code, and all have different bathroom requirements. The 1968 code required one bathroom for each sex for up to 100 people. The 2008 code required one for each sex for up to 150, a Buildings Department spokeswoman said.
New laws are not retroactive — they apply only to new construction and if a site changes its use or occupancy load. Adding to the complexity, waivers have often been granted to smaller restaurants allowing them to have just one unisex bathroom when they otherwise might have needed two."
So, this is complicated regulation! Why must there be any toliet regulation at all? In this age of twitter and Facebook, why can't restaurants choose whether they offer this amenity or not. Why must it be bundled into the package? Customers will have full information on whether they are visiting a store that has a toliet. If you can't predict when you need to use a toliet then you should go to a place that has one but why require this and limit the gains to trade?