“前门楼子九丈九,四门三桥五牌楼”;“前门楼子九丈九,九个胡同九棵柳”;“前门楼子九丈九,王口花炮响上头”。解放前,老北京的前门地区曾经非常繁华,很多老百姓在那里置办了自己的私宅。“经租房”的形成,跟特定历史时期人们的产权意识有关,也跟城市市民的产权硬度有关 “Front door floor nine feet nine, four three bridge five arches ”; “front door floor nine feet nine, nine alley nine willows ”; “front door floor nine feet nine, ”. Before the liberation, the old frontier area of ​​Beijing used to be very prosperous, where many ordinary people set up their own private houses. “RENTAL ” formation, with the specific historical period of people’s awareness of property rights, but also with the city residents about the hardness of property rights