Derek Thompson argues those interested in more housing in the United States should be more concerned with local NIMBY activity than private investment firms buying up homes to rent:

Far worse than corporations taking a few thousand units off the market for owners are the governments and noisy NIMBYish residents taking millions of units off the market for owners and renters alike—by blocking construction projects in the past few decades. (California alone has an estimated shortage of 3 million housing units.) From New York to California, deep-blue cities and states have amassed a pitiful record of blocking housing construction and failing to meet rising demand with adequate supply. Many of the people tweeting about BlackRock are represented by city councils and state governments, or are surrounded by zoning laws and local ordinances that make home construction something between onerous and impossible.

One of the issues at play here is a numbers one: who exactly is acting within the US housing market and how much sway do they have. Concerns about corporations and housing can be placed in the larger context of how many housing units there are and how many are being built. Here are the numbers Thompson provides:

The U.S. has roughly 140 million housing units, a broad category that includes mansions, tiny townhouses, and apartments of all sizes. Of those 140 million units, about 80 million are stand-alone single-family homes. Of those 80 million, about 15 million are rental properties. Of those 15 million single-family rentals, institutional investors own about 300,000; most of the rest are owned by individual landlords. Of that 300,000, BlackRock—largely through its investment in the real-estate rental company Invitation Homes—owns about 80,000. (To clear up a common confusion: The investment firm Blackstone established Invitation Homes, in which BlackRock, a separate investment firm, is now an investor. Don’t yell at me; I didn’t name them.)

If I am calculating correctly, institutional investors currently own 2% of the single-family rentals. Of course, this number could grow if these firms find this to be a good investment.

Also of interest is the number of new homes being constructed. Thompson links to figures from the National Association of Home Builders that shows 6.8 million new single-family units were created in the 2010s. So, concerns about big investors buying homes could be considered alongside housing construction: if the investors are buying more quickly than new homes are being built, this could be an issue.

Thompson settles on local actors – governments and residents – as holding back housing construction. In this numbers game, restrictions on a local level collectively are holding back the construction of single-family housing. If these restrictions were lifted or lessened, concerns about institutional investors would presumably diminish because there is a larger supply of houses to choose from.

One problem I see with this among the larger numbers: while local actors might in the aggregate have oversight over millions of units, they individually have control over relatively few units. Let’s say a particular suburb in the Bay Area (and this NIMBY argument often comes back to California) is against building new single-family homes. Depending on the size of the community and the availability of land, this might affect just a few homes to several thousand. This is not many. Zoom out to the whole region and many suburbs doing this adds up to tens of thousands of potential homes. Do this across all of California’s metro areas and the numbers add up. Similarly, you could do this across all the metro areas in the United States.

However, convincing all these municipalities to act in the interests of the region, state, or country as a whole regarding housing is a difficult task. Housing is local and this makes legislation at the state or federal level very difficult. California’s recent efforts with SB 50 did not go through. Illinois just recently gave some teeth – but not all the teeth – to affordable housing guidelines for communities set almost two decades ago. Federal guidelines are met with the suggestions that the suburbs are going to be abolished. One reason Americans like suburbs in the first place is that local government, presumably more responsive to the needs of residents, has the power to exclude (particularly on race and social class) and protect the existing single-family homes.

All of this does not necessarily mean Thompson is wrong. Yet, to get to the numbers of new homes constructed that would make a significant difference – whether in reducing the need many metro areas have for more affordable housing or outweighing the actions of investment firms – would require a lot of change across many communities. State or federal legislation may or may not be successful and would be unpopular in many places without a significant public groundswell of support that this is an issue that all or even most communities need to address.

Together, municipal changes regarding zoning and NIMBY could add up. But, changes would need to come across communities to make a big difference.