Try one of the restoration companies, IMHO, I think there will be a lot more involved that you are expecting. Most of the drains do not go outside immediately. I saw the actual construction in our house, and in our case it would have been a big deal to tap into the drain (floor was open for another reason). Also, the addition of another drain may require changes to the existing vent.
Good luck with your project.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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