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)