the original part of the house
original
/ə-ˈri-jə-nᵊl/
adjective
of, relating to, or constituting an origin or beginning : initial
not secondary, derivative, or imitative
being the first instance or source from which a copy, reproduction, or translation is or can be made
noun
that from which a copy, reproduction, or translation is made
a work composed firsthand
a person of fresh initiative or inventive capacity
gave her a copy of the report and kept the original
This painting is a Van Gogh original.
noun
oem