ketelkedo, reading the last posts here it seems that things are rather complicated in the project, I know for long time of building permit issues in this project, other projects designed by the same architect in the 6th district were stalled by the municipality for along time when they blamed the architect for the deviation from the building permit.
you should also be aware of the fact that there are two stages to the usage permit. the usage permit is issued by the municipality when they decide that the work is finished, based on many documents and declarations that the developer needs to provide, in order for it to become LEGALLY BINDING (which is what matters) they developer need to get the consent of the builder, the neighbors etc' if the Builder decline to sign the developer can either take him to court or pay him off... in nay case we are talking on a long period of time before those apartments will be legally usable and before any bank will agree to finance.