Being-built house mortgage refers to such a legal act that mortgager transfer his Expectant Property Right according to the presale contract of commercial building to the bank for getting a loan.

• 摘要楼花按揭是按揭人将其根据商品房预售合同取得房屋的期待权让渡给银行作为取得贷款的担保的一种法律行为。