买卖无效 meaning in English

redhibition

Tenant has preferential buy right , if the 3rd person wants to buy this house , must have tenant written the statement that abandons buying this house , otherwise this buying and selling is in not steady state , tenant can ask inside litigant effectiveness for a given period of time exercise is preferential buy right and bring about this buying and selling to disable
承租人有优先购买权，假如第三人想购买该房，必须有承租人书面放弃购买此房的声明，否则该买卖处于不稳定状态，承租人在诉讼时效内可以要求行使优先购买权而导致该买卖无效。