Of Unknown Origin (1983)
Two forces have claimed the house. Only one will survive.
With his wife and son on vacation, Bart Hughes, a banking executive, is left home alone to draft consolidation plans for his company. While doing his best to concentrate, Bart becomes obsessed with the scurrying and burrowing of rats in his Manhattan brownstone. His fixation soon grows uncontrollable as it destroys not only his high-powered business connections, but also his very expensive home.