How could such a thing be financed? If your value proposition is 'I have this apartment for sale/rent that's twice as expensive as the others, but in 20 years t

How could such a thing be financed? If your value proposition is 'I have this apartment for sale/rent that's twice as expensive as the others, but in 20 years time you'll have dry feet' - I'm not sure who would buy such a thing. Preppers would move to the boondocks in Montana anyway.