What urban housing design, once hailed as a helpful innovation, turned out to be a dangerous blight on the cityscape?

Name: What urban housing design, once hailed as a helpful innovation, turned out to be a dangerous blight on the cityscape?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The dumbbell tenement was initially designed to improve living conditions with better ventilation and light, but it became overcrowded and unsanitary, leading to poor living conditions and health issues.

What Urban Housing Design, Once Hailed as a Helpful Innovation