1) Legally, the house is still owned by the original seller;
2) Even if an agreement is sworn/signed for notarization, if the transfer formalities are not handled, the house will still be owned by the seller. You should know that the seller violated the agreement at most, and notarization can't solve the problem (the notary office won't help you recover it). In other words, the original seller can handle the property under his own name (including selling/renting/mortgaging others);
2) If the seller transfers/rents/sells the house to others, you can only move out;
3) If the seller mortgages the house to someone/an organization, resulting in the house being sealed up/auctioned, and you have no way or right to stop it, then the house/property will be empty! !
4) If the seller always abides by the agreement, you can't transfer/mortgage/lease/sell the house. In fact, you lose most of the rights and interests of the house, which is similar to buying a farmer's house;