The concept of circular economy has peaked in both popular and scientific discussion in the past few years. Notwithstanding, no specific definition for circularity in the context of existing buildings is available. This research details a framework of circular economy in the built environment, focusing on existing buildings. The paper employs a systematic literature review on circular economy within built environment. The majority of the reviewed articles date from 2016-2019, confirming the novelty of the research area. Based on the literature review, research on circular economy in the built environment has to date largely focused on designing to facilitate circularity in the future, or salvaging and recycling building materials for new construction. This paper suggests a literature-based framework comprising three complementary approaches to implementing circularity in the context of existing buildings: 1) Share; 2) Preserve; 3) Adapt, and; 4) Rethink. The transition toward a circular economy in the built environment requires structured approaches, like the one presented here. The presented framework allows researchers to expand their thinking on circularity in the built environment, while providing practitioners a selection of potential managerial approaches. The suggested circular approaches may be particularly useful for the longer-term strategy work of real estate owners and managers.

在过去的几年中，循环经济的概念在流行和科学讨论中都达到了顶峰。尽管如此，在现有建筑物的背景下，没有关于圆形度的具体定义。这项研究详细介绍了建筑环境中的循环经济框架，重点是现有建筑物。本文对建筑环境下的循环经济进行了系统的文献综述。大部分已审阅文章的日期为2016-2019年，证实了该研究领域的新颖性。根据文献综述，迄今为止，对建筑环境中循环经济的研究主要集中在设计上，以促进将来的循环性，或者为新建筑回收和回收建筑材料。本文提出了一个基于文献的框架，其中包括三种在现有建筑物的背景下实现圆度的互补方法：1）分享；2）保存；3）适应，并且；4）重新思考。在建筑环境中向循环经济的过渡需要结构化的方法，如此处介绍的方法。提出的框架使研究人员可以扩展对构建环境中循环性的思考，同时为从业人员提供一系列潜在的管理方法。建议的循环方法对于房地产所有者和管理者的长期战略工作可能特别有用。就像这里介绍的那样。提出的框架使研究人员可以扩展对构建环境中循环性的思考，同时为从业人员提供一系列潜在的管理方法。建议的循环方法对于房地产所有者和管理者的长期战略工作可能特别有用。就像这里介绍的那样。提出的框架使研究人员可以扩展对构建环境中循环性的思考，同时为从业人员提供一系列潜在的管理方法。建议的循环方法对于房地产所有者和管理者的长期战略工作可能特别有用。