“TRINITIES,” IN PHILADELPHIA PARLANCE, are three-room, three-story houses — one room per floor — built between the 1790s and 1840s.  They’re cozy, charming, evocative, historic, and, some might add, un-livable.

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Rear unit of my ‘double trinity’ in South Kensington, above. The property consists of two back-to-back trinities under one roof.

Trinities are not for everyone, especially those with bad knees or king-size beds. The smallest are only 100 square feet per floor. There’s a lot of going up and down stairs — narrow, twisty stairs at that.

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They’re cherished archetypes in Philadelphia (I know there are some in Baltimore and probably other cities, but Philly abounds in them). I’ve never seen or heard of such a tiny house in New York — correct me if I’m wrong.

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You can see very early trinities lined up on Elfreth’s Alley in Old City, but trinities are not just historic curiosities. They’re all over Craigslist, and real-estate websites, for 249K and up in the very best neighborhoods.

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I’ve owned a trinity in South Kensington since 2007 (all pictures in this post). In fact, it’s two trinities, back-to-back under one roof. The rear unit was vacant; I fixed it up nicely, but it still took a while to find a tenant. One woman said the stairs gave her vertigo. Someone else used the word claustrophobic. But when an agile young man bounded up and down those stairs with a big smile on his face, I knew I had the right guy.

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Trinities are found throughout the city, in Fishtown, Kensington, Queen Village, Graduate Hospital, Center City and elsewhere, often on narrow, cobbled alleys.

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As of this writing, there was a trinity for sale for 299K in Center City, and one for 249K in Queen Village. This greedy old-house fanatic wants another Philadelphia trinity!