Does anyone know how residential towers in Hong Kong are constructed? Is it like here in New York, where the concrete is poured into a mold of the floor or wall, and when the concrete dries, the mold is moved to the next floor? I've just been wondering. Also, why do most of the residential towers have windows that "pop out"?

That's correct.

Pop-out windows are popular among HK developers. They somehow quite like the idea that people can sit on the window sills and admire the view, or something... and that also counts as part of their "floor area" to bluff and boost the floor area of each apartment...

some new buildings are prefabricated off site and put together like a puzzle on site only, mostly used by the government in the public housing buildings to cut cost and time.

Does anyone know how residential towers in Hong Kong are constructed? Is it like here in New York, where the concrete is poured into a mold of the floor or wall, and when the concrete dries, the mold is moved to the next floor? I've just been wondering. Also, why do most of the residential towers have windows that "pop out"?

"bay windows" are hk developers' creative invention to gain extra floor spaces and make extra profit. when they bought the land from the government, there're tight restrictions on the overall floor area the development can have based on a certain "plot ratio". this however does not include the bay windows which means the developer can build as many bay windows without having to pay the land premium.

the interesting thing is they also include the bay windows areas as part of the flat areas to be sold to the buyers. how cheeky is that! (those bay windows are raised by at least 1m off the floor and they're selling them at full price to the buyers)