2005年8月6日,刘先生与某房地产公司签订一份认购书,约定刘先生以80万元价款购买该公司一套房屋。当天,刘先生交纳了3万元定金。同月8日,刘先生交纳了80万元房款,房地产公司将房屋交付给刘先生。当日,物业公司向刘先生交付了钥匙。随后,刘先生与物业公司签订了《房屋使用、管理 August 6, 2005, Mr. Liu signed a subscription with a real estate company, agreed to Mr. Liu 800,000 yuan price for the purchase of a company housing. The same day, Mr. Liu paid 30,000 yuan deposit. On the 8th of the same month, Mr. Liu paid a rent of 800,000 yuan, and the real estate company delivered the house to Mr. Liu. On the same day, the property company delivered the key to Mr. Liu. Subsequently, Mr. Liu and the property company signed a "housing use and management