This document provides an overview of urban renewal in high density cities. It discusses how urban renewal aims to address problems caused by high population density and outdated infrastructure, through redevelopment and regeneration efforts. The document outlines five dimensions of urban renewal: physical, social, cultural, economic, and environmental. It also discusses the negative impacts of high density development, such as pollution, heat island effects, and reduced access to light. The goal of urban renewal is to improve urban areas in a holistic and sustainable manner through coordinated redevelopment that enhances the built environment and quality of life.