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Please share an example. I'm curious now. I've never seen 20 units built on a 25 ft wide plot.

The standard NYC lot is 20x100 (some a little bigger, some a little smaller). The prewar walkup rowhouses that blanket the city fill the lot basically entirely, and can easily fit 20 units (one-bedrooms or studios) in dense/expensive areas. I lived in one up until recently -- 5 stories, 4 one-bedroom apartments per floor. The rowhouse schema is very flexible: in outer boroughs they can be single family, while in Manhattan they are endlessly subdivided. For examples of the type see:

https://urbanomnibus.net/2016/04/201604typecast-the-row-hous...

Oh I see. Typically a fourplex is four, multi-room homes in a single building. In San Francisco there are plenty of duplexes, two, single floor homes with a kitchen, two bedrooms and a bathroom. Maybe 900 sq ft. That fits on the typical lot and doesn’t require climbing 4 flights of stairs.

The buildings with more than 2 or 3 units tends to be on double or triple lots.

Sure I could see fitting 20 studios in a lot that size but SF needs a variety of housing. Housing for families, etc. Studios or even 1 beds won’t fit the need.

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