This Targets Playbook aims to assist cities and districts globally to develop and implement voluntary existing building energy efficiency (EBEE) targets and improvement programs. Chapter 1 provides step-by-step, case study-based guidance to assist cities to establish EBEE targets and improvement programs through four stages: assessment, development, implementation, and improvement. In each stage, the Targets Playbook provides an overview of questions for cities to consider, as well as possible approaches for cities to take based on real-world case studies. Wherever possible, useful resources are provided to help cities get started. Chapter 2 provides an in-depth review of the case study of Changning District, a leading low-carbon district in Shanghai, China, which successfully implemented a voluntary EBEE targets and improvement pilot program between 2013 and 2018. The case study provides a detailed example of how a district helped 45 commercial buildings reduce energy consumption by 25,423,662 kilowatt hours (kWh) and avoid 63,285 tons of carbon dioxide (CO2) emissions through an EBEE targets and improvement pilot program (SABR 2019).