Can I refer to this?
Interpretation of the Supreme People's Court on Several Issues Concerning the Applicable Law in the Trial of Disputes over Commercial Housing Sales Contracts Article 18 If the buyer fails to obtain the certificate of ownership of the house at the expiration of the following time limits due to the seller's reasons, the seller shall be liable for breach of contract unless otherwise agreed by the parties: (1) The time limit for handling the registration of ownership of the house as stipulated in the commercial housing sales contract;
(two) the subject matter of the commercial housing sales contract is an unfinished house, 90 days from the date of delivery of the house;
(3) The subject matter of the commercial housing sales contract is the completed house, which is 90 days from the date of conclusion of the contract.
If there is no liquidated damages stipulated in the contract or the amount of loss is difficult to determine, it can be calculated according to the total amount of house purchase money paid and with reference to the standard for financial institutions to charge interest on overdue loans stipulated by the People's Bank of China.