Green City Index as a reference to measure environmental performance and improve environmental quality. The growth and development of cities raises environmental problems, especially for cities that have strong connections to the capital of Indonesia such as Depok City. This study aims to obtain the value of environmental performance in the city of Depok with quantitative methods based on the Green City Index with eight assessment categories. The results of this study indicate that the environmental performance of the City of Depok with an average percentage of all categories of 50.2%. Average performance falls into six categories, namely, Energy and CO2, Land Use and Building, Waste, Sanitation, Air Quality and Environmental Governance. While the below average performance in the Transport and Waste category and above average performance in the Water category. For the assessment of community perceptions through the Index of Happiness obtained by 60% of happy people, 23% of people are very happy and 17% of people less happy about the state of the surrounding environment. So it can be concluded that the majority of the people of Depok City are happy living in Depok City with the current environmental conditions.

Increasing population has resulted in increased housing needs, but currently the available land for housing is decreasing. In addition, climate change has resulted in rising sea levels. With these three problems, it is necessary to develop a place to live with limited land and utilize the potential of Indonesian waters. The efforts that have been made by the current government by building settlements vertically, but have not been able to meet the needs of the residence. One type of house that can be developed by utilizing the potential of the waters is floating houses. A floating house is a residential building that is built on water by applying floating structures, materials, and shapes to suit the construction site. The floating house will function properly with proper planning, especially in the selection of technology at the bottom, floats, and the stability of the building above the water. Besides technology, other things that need to be taken into consideration are the selection of materials and the selection of the type of structure that will be applied. This technological innovation is expected to be able to meet the needs of residences that can utilize the territorial waters.

The Jatinegara Station area has developed as a commercial area causing the surrounding residential areas to develop into dense settlements and have limitations in providing facilities and infrastructure, especially green open spaces. Along with the increasing intensity of commercial activities, this has an impact on changing green open spaces into built-up land. The purpose of this study was to examine the existing condition of green open space in the Jatinegara TOD area and then compare it with the standards set by the local government. The results of this comparison are used to provide input on the design of green open spaces in the research area. This goal is achieved by using a quantitative approach. The analysis of the need for green open space is calculated based on the standard of 30% of the total area. The need for green open space is 20 m 2 per person and the Gerarchis method is used to calculate the need for green space based on oxygen demand. The analytical method used in this research is descriptive quantitative analysis. As the first step is to identify the characteristics of green open space, analyze the availability of green open space and its form and typology. Based on the results of the study, it can be concluded that the availability of green open space affects the environmental quality of the TOD area. The form and typology of green open spaces found in the study area are urban forest green open spaces and sub-district environmental parks. Therefore, the existence of green open spaces needs to be maintained through the development and arrangement of green open spaces by taking into account the types of vegetation that can absorb CO 2 .

The cost of housing construction tends to continue to increase and various efforts have been made to reduce the cost of building special houses. One of the technologies chosen in the construction of special houses with a fast process is to use a fabricated modular construction system. The purpose of this research is to produce a technical design for the Special House as a reference in the optimal and efficient physical construction of the Special House. Research and development research methods by way of assessing and testing a product. Product assessment and testing were carried out on 11 manufacturers who fit the criteria and have produced prefabricated / precast houses. After the implementation of primary data collection, it was concluded that there were 8 Manufacturing Modular Construction systems that were likely to be optimally applied to special home products. The conclusion of the research is based on an assessment matrix from the aspects of the work system, time to work, the number of workers, financial, social and cultural as well as zoning, which get the highest score, namely Steel as the main structure. Steel has been tested for its structural strength and can produce quite a number of building material components.

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