I was working as a Shift Commander in the patrol division for a large private security firm in Colorado Springs, Colorado. Part of the duties of said position is the locking down and opening up of certain office buildings on the west side and downtown patrol districts.
One of these buildings was a very old building constructed on or around 1880. Rumors about this building and its goings on had circulated among the ranks for as long as we had the contract. Many other supervisors reported seeing green colored mists, dark figures tailing them, voices whispering when there was no one there, lights in offices going on and off by themselves, and the sounds of footsteps and jingling keys.
The building was originally constructed as a hotel for upper crust springs society, but has long since been converted into offices for lawyers, accountants and such.
In order to keep these folks' offices safe, we were to enter the building and climb up the West stairs and lock the access doors to each floor after turning off the lights to that floor using antique switches next to the West stairwell access door. The building has 6 stories, 7 including the basement that has its own access from the outside, and has been converted into a Gothic dance club known as "The Underground".
Once you reached the 6th floor, you were to lock yourself in, turn off the lights and proceed across the floor to the East stairwell, where you would lock those doors working your way down.