编辑同志 :１９９８年４月 ,我与县建设银行签订了一份房屋买卖合同 ,将我的一套私房卖给对方开办储蓄所。合同签订后 ,建设银行付给我部分购房款 ,我将房屋腾出 ,但至今未办理产权过户手续 ,对方也未将剩余房款付清给我。请问 :我与建设银行签订的房屋买卖合同是否有效？刘植 Editorial Comrade: In April 1998, I signed a contract for the sale and purchase of housing with the County Construction Bank, and sold my set of private houses to each other to set up a savings bank. After signing the contract, China Construction Bank paid me part of the purchase money, I will vacate the house, but so far no ownership transfer procedures, the other party has not paid the remaining money to me. Excuse me: Is the contract of sale and purchase between China Construction Bank and China Construction Bank effective? Liu Zhi