Sustainable urban transformation has become a mantra for Chinese cities. While most studies focus on sustainable urbanization in megacities, the far larger number of medium-sized cities is understudied, although the latter face more severe urban problems. This article develops a framework for examining policy change in sustainable urban development initiated at the central level and reactions, tensions, and implementation issues emerging at the local level. It focuses on an in-depth case study of the challenges in realizing a transition from quantity-oriented pro-growth policies to sustainable quality-oriented ones in a medium-sized Chinese city. We find that there is evidence of changes in long-term values and goals toward sustainability a...