The Imperial Palace Outer Garden Low-Carbon Lighting Infrastructure project, completed in 2011 by Nikken Sekkei, represents a thoughtful integration of sustainability and public space design in central Tokyo. Located in the Outer Garden of the Imperial Palace in Chiyoda Ward, this park and plaza enhancement focused on modernizing the area's lighting systems while significantly reducing carbon emissions. The project demonstrates how contemporary environmental concerns can be harmoniously incorporated into the maintenance and improvement of historically significant public spaces. Through innovative low-carbon solutions, the design successfully balances the need for modern amenities with ecological responsibility, making it a noteworthy example of sustainable landscape architecture in an urban context.