I'm sure he meant the early 1900s. I've usually heard these called "streetcar suburbs" for obvious reasons. They tend to have a good mix of urban and suburban vibes. Unlike the car-focused developments after the war, these neighborhoods are super walkable with local retail or other spots just a stroll away, or a short streetcar hop. The design is all about pedestrians, with narrow streets, plenty of sidewalks, and often tree-lined avenues. The houses, seem to have been more often built by skilled craftsmen, and have unique architectural details, unlike the cookie-cutter homes you see in later post-war suburbs.

This is a depressingly good question. I hadn't ever considered we'd be far enough into this one to refer back to the 90's and early aughts as "turn of the century"

Sorry, yes, 19th to 20th century. Neighborhoods with the Full House house basically.