Fast-growing cities face challenges of populations to shelter, huge infrastructure needs to finance, a changing climate to adapt to, and the imperative to thrive in an evolving global economy. Meeting these challenges will determine a city's success and quality of life. Decisions and policies may lock a city into a long-term physical form that proves suboptimal over time. Undesirable physical forms can set back a city's development for decades. Integrated planning approaches are needed to address these complex and interrelated urban sustainability issues, and create co-benefits for cities.