The Flooded Building

I was walking around what appeared to be an outdoor or indoor mezzanine connecting two or three large office buildings. Other people were walking around. I wasn’t sure exactly what floor I was on, but when I came to a set of stairs leading down, I could see the lower level was flooded. Someone warned me not to go down there. Then as I looked out over a balcony, I could see the whole area was flooded. I came to another staircase, and this time I could go down to the lower level. I could see water marks on the columns where they were once flooded. As I looked ahead, I could see the waters had receded and were now at about the same level as the floor I was standing on, still partially flooding one small area.