Should the property company be responsible for the flooded vehicles?

Yes, the property management company has not provided evidence to prove that it has fulfilled the necessary duty of care. According to the regulations, if a party fails to perform its contractual obligations or fails to perform its contractual obligations, it shall be liable for breach of contract such as continuing to perform, taking remedial measures or compensating for losses. Therefore, the property company should bear the corresponding liability for breach of contract. The contents of Article 488th of the Civil Code of People's Republic of China (PRC) shall be consistent with the contents of the offer. If the offeree materially changes the contents of the offer, it is a new offer. Changes in the subject matter, quantity, quality, price or remuneration, time limit, place and method of performance, liability for breach of contract and dispute settlement method of a contract are substantial changes to the contents of the offer.