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Yeah I know, keeping the internals of a building at a constant level of high humidity can wreck the internals of the building and cause as much if not more damage than rising damp or penetration.
But you cannot fix it without removing the source of the humidity or physically getting the water out - which might be as simple as residents needing to open the windows when drying their clothes or use a dehumidifier and not block the trickle vents on double glazing etc.
Its the green algae that dangerous to health. Keep the area ventilated.
Damp can cause serius structural problem its in the landlords interest to fix it.