Mild-mannered Office of Planning and Community Development senior planner Nick Welch doesn’t look like the kind of guy who would pick a fight. But if I was him, I would advise against bringing his recent PowerPoint presentation into a local bar.

Welch confined his presentation to the safety of city council chambers last week, where he ran his slide show in front of the Select Committee on Citywide Mandatory Housing Affordability. There were no fisticuffs, but the MHA presentation did draw scoffs from the neighborhood protectionists in the audience and a challenge from their council ally on the dais, West Seattle council member Lisa Herbold.

Particularly Slide No. 10, which is possibly the most contrarian slide ever presented in Seattle.

MHA is a holdover HALA housing plan from former Mayor Ed Murray that exchanges upzones for affordable housing; HALA is expected to produce 20,000 new housing units over the next decade, including about 6,000 new affordable units from MHA (compared to just 205, if the city simply let the market status quo play out without MHA). With Murray long gone, the remaining piece of the plan—a narrow, stair-step upzone along the fringes of 27 single-family zones —is being shepherded through City Hall by council YIMBY Rob Johnson, whose term ends next year, and with strong support from first-year urbanist all-star, council member Teresa Mosqueda.

Slide #10 is a direct response to what Welch and other OPCD staffers have heard over and over in Seattle neighborhoods (where, in fact, Welch has been gathering input in countless MHA community forums over the last few years): New market-rate housing is a threat to overall housing affordability because it’s more expensive than existing options. It’s a seemingly intuitive take on gentrification that defines the local anti-development storyline and unites everyone from Magnolia First NIMBYs to social justice socialists, from dudes at the Wedgwood Broiler to queer working artists at Kremwerk.

The ubiquity of Seattle’s anecdotal anti-development refrain convinced OPCD to see if that narrative was actually true. So the department looked at the germane historical data—market-rate housing production between 2000 and 2015 in all of Seattle’s census tracts, overlaid with the change in low-income households in the same census tracts over the same period. The finding was definitive. The text to Slide #10 spelled it out for council members: “No correlation between market-rate housing growth and loss of low-income households.”

If anything, the trend line shows the exact opposite: Affordable housing stock increased as market rate housing production increased.

A potential criticism of Slide #10? It defined affordable housing as housing that people making less than 50 percent of the Seattle Area Median Income (AMI) can afford. Affordable housing advocates could certainly contend that people making 60, 70, and 80 percent of AMI are part of the working class too, and are losing ground as more market development comes on line to serve tech bros. But, voila: Slide #11.

This slide overlaid the same snapshots of affordable households and market-rate housing production, this time defining affordable housing as housing affordable to people making up to 80 percent of AMI. The conclusion was the same. No correlation between new production and economic displacement.

The data didn’t lead OPCD to go as far as saying more market rate housing production actually led to the creation of more affordable housing, but they did present another contrarian slide illustrating their research on another bit of conventional wisdom—that the MHA upzones will lead to physical demolition of existing affordable housing at a rate that neutralizes any new affordable housing production from MHA. Again: Nope. Gaming out future physical displacement based on historic trends of production and teardowns, the data shows that teardowns remain roughly consistent whether the city enacts MHA or not. Without MHA, about 520 households would be physically displaced by demolition, with no mandatory affordable housing to replace them. Under the city’s preferred MHA alternative, about 574 would be displaced—and those demolitions would be dwarfed by an estimated 5,633 new affordable units created under MHA.

One other bit of conventional wisdom that OPCD tried to fact-check is the notion that new development displaces people and businesses that share a common culture, a phenomenon known as cultural displacement. Perhaps even more than economic displacement, cultural displacement is at the emotional core of anger about gentrification. OPCD couldn’t confirm or disprove this observation. The data—the change in housing production overlaid on change in racial population—was all over the map. The population of some groups, including African-Americans, declined in some census tracts where market-rate housing increased and stayed put in tracts where market-rate housing increased.

Of course, one factor that could have mitigated displacement was missing from that historical data: MHA’s mandate that affordable housing be part of new development.

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