Part three : causes of the development trend of leasehold and socio - economic values of the development . legislation for lessee interests is efficient amse of the development . use manner of society property is the ultimate reason of the development 租賃權物權化直接源于各時期各國保護承租人的立法,而根源于社會財產的利用方式,社會財產運用“租賃”的利用方式越普遍,租賃權物權化的傾向就越明顯。