In a welcome change from the zombie metaphor, Newsweek considers chronically unoccupied rental properties as ghost apartments.
Across the globe, empty luxury apartments darken many of the most desirable cities—Miami; San Francisco; Vancouver, British Columbia; Honolulu; Hong Kong; Shanghai; Singapore; Dubai; Paris; Melbourne, Australia; and London.
There's another Gothic detail to this, the classic association of power with architecture:
The reason: The world’s richest people are buying these grand residences not to live in but to store their wealth. In Paris, for instance, one apartment in four sits empty most of the time.