In March 2012 a World patent application, An underwater-above water accomodation, especially for residential purposes by the company was published. Here is the main drawing.
The patent document describes how the rooms are built on legs, but the article gives extra details. The rooms would be at a depth of 10 metres. If they are too deep, the colours in the sea are lost (this saves on construction costs, too). To prevent scaring the fish with loud noises, the lavatories and air conditioning would be placed away from the windows.
There's a rather cool video showcasing the technology: