Smart contacts are always going to run into the problem of interacting with the outside world. An apartment exists in the outside world, so to have a smart cont

Smart contacts are always going to run into the problem of interacting with the outside world. An apartment exists in the outside world, so to have a smart contract for this, blockchain (or any digital) stuff isn't going to be sufficient. There are two, broad ways for smart contracts to be useful. Either, there's some way of interacting with real world objects. Or, the contracts pertain to something completely digital that can be encompassed in a blockchain, like exchanging other digital assets. The former also requires outside realities (eg a court orders that a smart contract is void) to be reflected back to the blockchain. The latter, at least in theory, can be code only, and therefore plausibly decentralised.