Buildings account for 40% of global greenhouse gas emissions. Improving the energy efficiency of existing buildings through programs like LEED's EBOM can significantly reduce emissions. HKU's CYC and TTT building retrofit project in Hong Kong demonstrated energy savings of 30-33% through upgrades like HVAC and lighting improvements. However, achieving the certification required demonstrating actual performance, which depends on organizational support and user behaviors. EBOM projects can be challenging but provide lessons for improving building operations and sustainability efforts in China and Asia.