That is interesting. I would be hesitant in viewing a condominium as a 20-year investment. There are so many variables that can not be accounted for, such as:
a) How will the building be run over the next 20 years; and,
b) What will the costs be in twenty years for maintaining the building.
I see investing in a condo for 20 years to be much different than a house / land. Good house / land investments have infinite potentials in the long run, whereas a condo only has three: 1. Live there; 2. Sell it; and 3. Rent it as live or live/work.
Then again, you can always listen to Brad Lamb who says to buy a condo and you will IMMEDIATELY make $40,000 PROFIT (read his article
here, and my blog response
here).