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As cities become more desperate to add more affordable housing options, legislators are examining how the zoning codes will allow for more density. This New York Times piece demonstrates what a dramatic shift new zoning would be for major markets across the nation, along with the resistance and the advocacy.

Single-family zoning is practically gospel in America, embraced by homeowners and local governments to protect neighborhoods of tidy houses from denser development nearby.

But a number of officials across the country are starting to make seemingly heretical moves. The Oregon legislature this month will consider a law that would end zoning exclusively for single-family homes in most of the state. California lawmakers have drafted a bill that would effectively do the same. In December, the Minneapolis City Council voted to end single-family zoning citywide. The Democratic presidential candidates Elizabeth Warren, Cory Booker and Julián Castro have taken up the cause, too.

A reckoning with single-family zoning is necessary, they say, amid mounting crises over housing affordability, racial inequality and climate change. But take these laws away, many homeowners fear, and their property values and quality of life will suffer. The changes, opponents in Minneapolis have warned, amount to nothing less than an effort to “bulldoze” their neighborhoods.

Today the effect of single-family zoning is far-reaching: It is illegal on 75 percent of the residential land in many American cities to build anything other than a detached single-family home.

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