It's sad these days where practicality, comfort and function are sacrificed over squeezing an extra rooms -- it's more desirable for renting it out to students or young people in a roommate situation, not a unit to be bought by an end user.
I'm surprised that the 6th floor terrace level are all tiny units (345-600 sq.ft.) where the units are almost the same size as the terraces, but I'd guess when you are on Yonge you want to be far above the street as possible, however the balcony depths also taper the higher up you go.