This data is the aggregate data of Project PLATEAU LOD1 and OSM building by Tokyo small area zones used in the following paper, which was accepted to the FOSS4G academic track. For details, see below manuscript: Seto, T., Furuhashi, T. and Uchiyama, Y. 2023. 1.1.1 Role of 3D City Model Data as Open Digital Commons: A Case Study of Openness in Japan's Digital Twin "Project PLATEAU". This data is provided under CC-BY-SA 4.0.
Original CityGML data from the PLATEAU project are available under the CC-BY 4.0, ODC BY, and ODbL licenses at the official CKAN data portal. (in Japanese): https://www.geospatial.jp/ckan/dataset/plateau.