Building Operations, Computerized Maintenance Management Systems (CMMS), Facility Management, Facility Management Software, HVAC Systems, Life Safety Code, Maintenance Management, Maintenance Management Systems, Plant Operations, Plumbing, Prioritization, Refrigeration Systems, Troubleshooting, Utility Plant Operations. For over 200 years, JLL (NYSE: JLL), a leading global commercial real estate and investment management company, has helped clients buy, build, occupy, manage and invest in a variety of commercial, industrial, hotel, residential and retail properties.