East is a different concept from North. North is related to Map. Map is related to Property. Estate is a type of Property. 
you are likely to find Human in/at/on Bathroom. Toilet is part of Bathroom. Toilet is related to Can. you are likely to find Beer in/at/on Can. 
East <--DistinctFrom--> North <--RelatedTo--> Map <--RelatedTo--> Property <--IsA-- Estate 
Human --AtLocation--> Bathroom <--PartOf-- Toilet <--RelatedTo--> Can <--AtLocation-- Beer 