Neurosis, as defined by Dictionary.com
A functional disorder in which feelings of anxiety, obsessional thoughts, compulsive acts, and physical complaints without objective evidence of disease, in various degrees and patterns, dominate the personality
I truly fail to see how anyone, other than the "tenant" you're referring to, has neurosis. Care to elaborate?
Or perhaps explain why the tenant agreed to buy a house without inspecting the attic or roof? That ought to be quite the story in itself.