1. Auction is an entrustment contract; Second, the "original value" of housing auction refers to the fruits when buying a house. The fruit belongs to the original. Auction the original value of the house, including the purchase of the house.

Second, is it a breach of contract if the loan for buying a second-hand house fails?

According to China's relevant judicial interpretation, when buying a second-hand house, if the mortgage loan fails to pass and the contract cannot be performed, it is not a breach of contract due to reasons other than both parties. According to Article 19 of the Interpretation of the Supreme People's Court on Several Issues Concerning the Applicable Law in the Trial of Commercial Housing Sales Contract Cases, the commercial housing sales contract stipulates that if the buyer fails to conclude a secured loan contract for commercial housing due to the reasons of one party, the other party may request to terminate the contract and compensate for the losses. If the commercial housing secured loan contract cannot be concluded due to reasons not attributable to both parties, and the commercial housing sales contract cannot be continued, the parties may request to terminate the contract, and the seller shall return the principal of the purchase price and its interest or deposit to the buyer.