This book investigates the dynamics and the role of green urban regeneration using nature-based solutions (NBS) in contributing to the cultural aspects of public spaces. In the first part of the book, insights on analytical methods, planning strategies and shared governance examples are given, as well as, an assessment tool, namely public space index (PSI), is given for successfully measuring sociability impact while using a placemaking approach to green urban regeneration processes. In the second part, the case study (Rose Kennedy Greenway of Boston, MA, USA) has been extensively researched during many years of observations and analysis which gives a realistic taste of the implementation of the proposed PSI. The book’s last part reflects on PSI to measure its adaptability and replicability in other contexts, whereas NBS are playing a major role in physical and spatial green urban regeneration in current cities contexts’.