I wonder who the developer thinks they are going to let/sell the upper floors to now.
Aah... but you don't understand the business model of these hideous London monstrosities that keep on popping up around the place.
All the prime stuff in the developments (i.e. "penthouse suites" at the top of the building etc.) are sold off-plan on day one to gullible foreigners (or even before day one at international tradeshows). Most of whom have probably not even visited the "marketing suites" which are the first thing the developers build on the plot.
So the question is not who the developer is going to let/sell to.... but rather who the poor sod who bought the thing is going to let/sell to.