They're getting the sale of residential units on the lot going. Yet another sign that the project as a whole is getting closer to construction.
Those are the residential components they're selling.
More renderings and info if you're curious and can read French:
http://www.issy-sortezducadre.fr/hau...ideo_residence
Ok, far from perfect, but residential towers have been banned for so long over here that it's still a little something to begin with. Moreover, this isn't supposed to be any kind of luxury and includes a little bit of social housing, but it's likely to be rather expensive anyway, because of the local shortage of available homes.