**5. Conclusions**

This study focuses on the construction of an evaluation system of an existing industrial zone using the principles of sustainable development, which takes the natural, economic, and social elements of the existing industrial zones into overall consideration and constructs an indicator system of six dimensions: land, building, industry, ecology, landscape, and culture.

Combined with the renovation of Chongqing Pigeon Brand Wire and Cable Co., Ltd., six categories of level 1 indicators and 43 categories of level 2 indicators were generated, and the data before and after the transformation were measured, calculated, and compared. After the transformation, the sustainability of land, architecture, industry, ecology, landscape perception, and culture increased by 33%, 40%, 35%, 16%, 36%, and 39%, respectively.

As far as the transformation of a complete industrial zone is concerned, both the time span and the space span are quite large. In different stages of the project, the content and importance of the indicators used for evaluation will be different, and there are some deficiencies in the comprehensiveness of the indicators. Due to the lack of early data in the old industrial zones, the operability of data calculation in development and construction is poor, and the objectivity of the scoring results is still insufficient. Furthermore, this study is primarily aimed at the transformation of old industrial zones into cultural, creative, and office zones, with a limited scope of application. The economic, social, and environmental indicators will change according to the types of industrial zones before transformation, and the functions and demands after transformation. Further study on the sustainable development evaluation of different transformation types would be needed to guide the implementation and promotion of the sustainable transformation of existing industrial zones.

From the perspective of multiple disciplines, this study runs the concept of sustainable development through the whole process of transformation, which is more conducive to the comprehensive sustainable development of industrial zones. The purpose of the evaluation is to promote the implementation of the transformation of industrial zones. Therefore, this study selects indicators from the fields of ecology, urban planning and design, and landscape design. It can be found that, in the transformation process of the

industrial zones, the cooperation of various disciplines is needed, and the concept of sustainable development in various professional fields runs through the whole process of transformation. Only in this way can it be more conducive to the comprehensive and sustainable development of the industrial zones. It is expected that this method can be used in the transformation of existing industrial zones.

**Author Contributions:** Conceptualization, X.Z. and M.T.; methodology, X.Z.; software, Y.C.; validation, X.Z. and Y.C.; formal analysis, X.Z.; investigation, Y.C. and Y.Z.; resources, E.Y.; data curation, Y.C.; writing—original draft preparation, X.Z.; writing—review and editing, E.Y.; visualization, Y.C.; supervision, X.Z.; project administration, X.Z.; funding acquisition, M.T. and G.W. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by the National Key Research and Development Program of China [2016YFC0503603, 2018YFC0704900].

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data presented in this study are available within the article.

**Acknowledgments:** The authors thank the reviewers for their valuable suggestions.

**Conflicts of Interest:** The authors declare no conflict of interest.

#### **References**

