It isn't as much about blockchain, than what NFTs enable. Properties can be sold digitally, like any other goods are on e-commerce websites, for example. Of course, NFTs aren't strictly needed, but could be used as a cryptographically secure (for some definition of secure [0]), publicly verifiable, record of ownership.

[0] https://moxie.org/2022/01/07/web3-first-impressions.html