I am not arguing with you personally, but for theory debate, what is the point of this? When combining a higher price per sf of smaller units with a lower price per sf of larger units for an average, it ends up never valuing the price per sf of smaller units and valuing the price per sf of larger units.
In addition, price per sf is impacted in condo units by corner or not a corner, view, high floor vs low floor etc.
It makes sense to compare price per sf for 2,000-25000 higher floor units, for example.
A smaller unit that is upgraded sells for more per sf than a larger unit that is not upgraded. There are so many factors that IMO make price per sf a less reliable metric and adjusting for the variables to account for for their influence would be very time-consuming.