This should clear a few things up
The developer is gunning for 2,265 units from the 995 allowed "as-of-right."
The developer owns (2)46 Johnston Ave; 7-39 & 46-50 Aetna Street, but not 41 and 52 Aetna Street as that has been the subject to a recent RFP from the Jersey City Development Agency, per NY YIMBY & Jersey Digs.
The three mid-rise buildings look like 13 floors each. The downtown development map lists 39 Aetna at 189 units and 50 Aetna as 106 units. Both are shown as approved. Even if the rezoning quadruples the allowable density for both the Aenta sites, (2)46 Johnson Ave is still looking at over 1000 units. So it should be pretty substantial at around 60 or 70 floors. This one is moving a little slower than the other Liberty Harbor one, but the developer still expects full zoning approval by the end of 2017 and commencement of construction by 2018.