> What can they do then? Build new apartments for you? Do the same thing an airline does. If a flight is cancelled, they don't just refund the original price y

> What can they do then? Build new apartments for you? Do the same thing an airline does. If a flight is cancelled, they don't just refund the original price you paid for the ticket. They have to get you to the destination. If the only available option is a first class seat, it's their problem, not yours. They don't ask you to either pay $1000 for the price difference and get on the next flight or get your $100 back and try to get to the destination on your own. So in this case, the alternative was not building apartments. It was to eat the price difference and house OP in another listing or even a hotel.