Mystery drain hose into bathroom sink drain

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Something to check

Where is your water heater in this condo? Could this be a T&P relief drain

Typically a condensate drain is 3/4 inch
A lot of old relief lines were 1/2
 
Something to check

Where is your water heater in this condo? Could this be a T&P relief drain

Typically a condensate drain is 3/4 inch
A lot of old relief lines were 1/2

After double checking it, the relief is hooked up through hard copper and feeds back into a shared wall with a neighbor. where is goes from there is a bit hard to tell. Though I will also mention, the pipe coming out of the wall at the sink is PVC, It doesn't seem very likely, to me, that somewhere in the walls there is a transition from copper to PVC.
 
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