There is an ongoing cost to LEED buildings. Property owners will be required to maintain the facility's sustainable performance and monitor its energy consumption. The standard aims to keep buildings on the path toward sustainability, but it will not punish those that are not performing well, according to Ashley Katz, spokeswoman of the U.S. Green Building Council. While some see this as burdensome, Kent Schwendy, senior vice president at engineering firm Fuss & O'Neill, takes a different view. "Monitoring is something you should be doing already," Schwendy said. "That's how you get your return on investment, by monitoring your building's performance into the future."