A Study on Condominium and Those Influence on Housing and City Policy

阐述了东京市中心除大厦外的所有权分割建筑物的真实的状况及其对住宅和城市政策的影响。本研究以千代田区与中央区的524个街区为对象，进行地籍与建筑物使用调查，并对325名公寓业主进行问卷调查。通过查阅权利转换的书面计划和再开发工会的听证会，我们调查了城市再开发项目中10栋建筑物的真实的房地产和共管的可能性。在东京市中心，除大厦外，所有权分割的建筑物正在增加。这种建筑的建筑面积占千代田区总建筑面积的30%，并且有许多建筑超过了豪宅的十倍。而在建筑过程中产生的公寓约占20%。建筑物区分所有权的特点是分割规模小、分割数量少，业主多，即小开发。但在千代田区，大型建筑的比率是压倒一切的。因此，我们通过这些建筑的地域差异来说明其双重性和区位性。通过对无隔离墙区分所有权建筑物的使用空间类型的考察，阐述了建筑物使用与建筑物建造的独立性，从共同使用的角度，强调了建筑物使用的狭隘性与争议性，阐述了城市再开发项目中的先有权利与建筑物使用的关系，阐明了无隔离墙区分所有权建筑物的真实的状态，并探讨了所有权与建筑物使用之间的实际控制。因此，我们明确的可能性，新的方法，再开发项目的组合公寓不同于现有的大规模再开发。

We explicate real state of buildings of divided ownership excepting mansion and those influence on housing and city policy in city center of Tokyo. We carry out survey of cadastres and building-use in 524 city blocks of Chiyoda and Chuou ward, and survey by questionnaire to 325 owners of condominium. And we investigate on real estate and possibility of condominium on 10 buildings of urban redevelopment projects, by perusal of written plan on conversion of rights and hearing to redevelopment unions.Buildings of divided ownership excepting mansion are increasing in city center of Tokyo. A rate of gross floor area of such buildings is 30% of total gross floor area in Chiyoda ward, and a number of such buildings exceeds decuple of mansion. And rate of condominium produced after building process is about 20%. So we need anew examination of such cases involving a possibility of condominium.Characters of condominium are small-scale and small quantity of division and those owners, what is called mini-development. But in Chiyoda ward, a rate of big-scale buildings is overriding. So we explicate double character and locational quality by regional differences of such buildings. And we explicate independence of construction as well as building-use from investigation on types of space for access in such buildings, and emphasis on narrowness and controversial point from view points of joint use.We explicate relation of previous rights and building-use as a result of urban redevelopment projects, clarify a real state of condominium without party wall and investigate on practial control of between ownership and building-use. And so we make clear of possibility on new method of redevelopment project as combination of condominium differ from existing large-scale redevelopment.