It's the Hong Kong way: when one shop starts selling a particular item, outlets all around start offering the same product. But in one Causeway Bay high-rise it is not kitchen appliances or bathroom accessories on sale. It is sex.
In the centre of the shopping heart of the city is the Fuji Building, painted pink. The block has 22 floors - and 18 of them are home to one-woman brothels, with between five and eight of them on each floor.
In all, the Lockhart Road block is a workplace for 100 prostitutes - and it is all completely legal.
Asked about the de facto red-light district, police said prostitution was legal in Hong Kong, but that soliciting, living off the earnings of a prostitute or controlling a woman for the purpose of prostitution was not.
Renting a flat or apartment to a prostitute does not make it a vice establishment in law. It is only classed as such if more then one prostitute is working there.
The Fuji Building may be full of prostitutes, but so long as each individual flat can be shown to be a separate unit from all the rest - that it has its own water connection, electricity meter and no one else can access it - it is above board.