The plants plus pebble-saucers would keep each other a little more humid if moved closer together and drafts were blocked.
If it were me, I might drape a clear plastic drop-cloth around the grouping of plants, hanging from the ceiling, to hold some more humidity in. But that would look very uncivilized!
If the pipe leak upstairs let mold take hold in the walls and ceilings, you might have mold "forever". I hope the staff arrange for a "mold remediation" company to come in and strip the walls and bleach things, or whatever they do to reduce the amount of mold remaining.
