Biological is related to Cell. Cell is related to Building. 
Factor is related to Property. Property is related to Private. Private is a different concept from Known. Known is derived from Knowledge. 
Biological <--RelatedTo--> Cell <--RelatedTo--> Building 
Factor <--RelatedTo--> Property <--RelatedTo--> Private <--DistinctFrom--> Known --DerivedFrom--> Knowledge 