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When I recently asked Mayor Eric Garcetti of Los Angeles about his stance on S.B. 50, the legislation that would have allowed more apartment construction near transit, he said it wouldn’t be a good fit for the city.

S.B. 50, he told me, would threaten the character of existing neighborhoods. And L.A., the state’s largest city, already builds more than its fair share of new housing compared with other cities in the county, he said.

This week, though, Emily Badger and Quoctrung Bui, my colleagues at The Upshot, reported that apartments and townhomes — anything other than detached, single-family houses — are banned from 75 percent of L.A.’s residential land.

All of which raises the question: When you’re dealing with a housing crisis, should a city even have single-family zoning? As Emily and Quoctrung reported, that’s a question cities across the nation are grappling with.