What is a key factor in LEED v4 for existing buildings?

Operational optimization is a fundamental aspect of LEED v4 for existing buildings. This credit focuses on enhancing the performance of a building's operations, which includes improving energy and water efficiency, reducing waste, and maximizing resource use. The emphasis on operational strategies is crucial, as many existing buildings often have the potential for significant improvements through optimizing their day-to-day functions rather than just focusing on physical renovations or new construction.

In the context of existing buildings, operational optimization can lead to cost savings, improved indoor environmental quality, and greater overall sustainability. It encourages building operators to implement best practices, utilize technology for monitoring and controlling building systems, and engage in regular maintenance and management practices.

This approach contrasts with other options, such as design innovation (which is more relevant to new projects), expensive renovations (which may not always provide the best return on investment), and the idea of new construction only (which does not apply to existing buildings). Thus, operational optimization stands out as a key factor that provides tangible benefits to existing buildings within the framework of LEED v4.