> If you owned one of those units, could you just get outvoted a lose a million-dollar condo like that?

You'd have a share of the claim on the value of the land.

Presumably everyone voted to tear it down because the building costs more to maintain as-is, than to tear down and rebuild.

My guess is the condo votes to sell the land to someone else, distribute the money to the condo owners and then dissolve. Generally the condo isn't worth a million dollars anymore though as the building is old. Or maybe it is worth a million but you were paid 1.1 million to get out as whatever replaces it is that much more valuable (if it really was worth a million I'd guess not, but the million dollar condos of 1950 are not worth nearly that much today but the land itself is worth a new million dollar condo.

It is also possible the condo voted to tear down the building and build new - if you owned the condo before you will have one again in 2 years, but you are required to live elsewhere in the mean time. (Million dollar condos in Iowa implies you can afford a second house/apartment, while in San Francisco it would not)