Over at Sightline they've got a new piece that is interesting. In "Yes, Oregon, There Is a Way to Build Enough Homes" they look at the housing production in the 1970s, and suggest that widespread downzoning in the 1970s was one ingredient in the decline in housing production.
Multifamily construction in Oregon soared in the 1970s, plummeted in 1980, and has never recovered. By the 2010s, the share of net new Oregon homes in multifamily buildings hit its lowest average in 60 years.
In part, that’s because the public backlash against what former Governor Tom McCall had called “coastal condomania” had also reached far inland. For example, as part of a national trend in the ‘70s, a major downzone banned apartments from much of inner southeast Portland.
We've touched on the rise and fall of construction before here, most recently on last year's Council Work Session on housing.
There is some evidence for increasing downzoning here in Salem also.
This will just be a glancing, impressionistic survey, and there are many questions to follow up on in more detail. There are overlapping debates that could have led to downzoning, and not all the downzoning was aimed at banning apartments in the city. A lot of the discussion in the papers about downzoning concerns rural land and County planning, zoning, and land use decisions. It looks like the County had to approve the City's plans, and that
appears to have been unwound in today's regulatory scheme, for example. Any good history of 1970s action will also require more knowledge of land use law itself, of SB 100 and the early DLCD, of County-City relations, and of City planning documents. Since this remains in living memory for some, you may know more about one or more of these!
Just at the city level, the adoption in late 1974 of new Statewide Planning Goals arising out of SB 100 and the development of Neighborhood Associations, together seemed to trigger new interest in downzoning. There was also was a recession around 1980 and so it is important to say the downzoning was but one ingredient in any decline in housing production, and not the only factor. (The Sightline piece discusses a couple other factors, too. There are multiple variables in play here and, again, this is merely a sketch.)
The Comprehensive Plan Map was not always Aligned with the Zoning Map
The 1973 Comprehensive Plan described "rapid production" of apartments. Interestingly it did not "distinguish between Single-Family and Multi-Family Residential areas" and talks at least in passing about a "mixture of residential with other uses in and near the core area and along major arterial streets." This may represent a course-correction from the 1963 Plan, which employed "buffer zones" between single detached housing and commercial zones. Any shifting extent for sort-and-separate zoning is not clear. The 1973 Plan and zoning map deserve a closer reading.
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On housing in the 1973 Comp. Plan
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But the Comprehensive Plan soon came under fire. In 1975 it was in the news.