Initially, Volker / HBG was project developer for the Blaak reconstruction. The main change in this phase was the shifting of the overall plan due to a changed location of the library. In March 1980, a few weeks before the first pile was driven, HBG dropped out.  
Developer Omega took over and in July 1980 presented a revised plan (the so-called "Omega Project"). Main changes were reducing the number of cube houses and adding a residential tower (Blaaktoren) on the center side and a flat on the Gelderse Kade; all to make the plan feasible.
Finally, in August 1980, the BV Oude Haven was established, which continued to act as roject developer.
[source: Construction 1985/20, p57-62]