Synthetic vs authentic

I am currently sitting at a retrofitted warehouse converted into a bar. The bones surrounding the space are without a doubt authentic and the new bar itself is without a doubt synthetic (added paint, synthetic material selections for longevity , ect.). At what point does the synthetic become the authentic experience and vice versa; or is this question undeniable proof the English language/my lamen English understanding are overshadowed? I am not sure. I do know the wall mounted directional oscillating fan has roughly the same amount of accumulated dust as the roof structure holding up the standing seam metal roof. The two have undeniably conversed into a new thing; retrofit being the best articulation of circumstances.