Why do so many Pennsylvania homes have freestanding toilets in their unfinished basements?

• 01:21 - Pittsburgh toilet - Wikipedia
• 02:44 - The dual toilets at Cloister Cafe - Yelp
• 04:19 - Peculiar Pittsburgh: The Pittsburgh potty ... explained - YouTube
• 06:50 - Documenting The Pittsburgh Potty - 90.5 WESA
• 07:46 - The original version of this story misidentified this quote. It's from realtor Stephen Cummings.
• 08:11 - Slavery in Pittsburgh - Popular Pittsburgh
• 11:33 - Architect Offers Explanation For Pittsburgh’s Basement Toilets (And It’s Not What You Think) - 90.5 WESA
• 15:16 - Andrea Allen
• 16:22 - Double D Plumbing - Manta