Previously, the shape and detail of the construction has been very evident from the 4th floor observation deck. Since the level of the construction is now at 6+ floors, not much detail beyond the right side of the structure can be seen from that viewing point.
If the new building is scheduled for 15 floors as noted in the plans originally described months ago, it will be the same height as the Tower. At the current rate of construction we'll still be able to see the majority of from the 15th floor for a few more months at least.