[waqf]

I assume you're referring to the graph on the page you linked. Is there an explanation somewhere of exactly how it is calculated?

I tried to read the "article" underneath the graph but it just seems to be a disjointed collection of assertions strung together with inappropriate connectives and insane formatting.

[tootie]

The caption is a little vague, but it says the source is census data by which they mean the US Census Bureau which does an estimate of housing every year.

Moodys has a more technical analysis if you have patience to read it all using both census and realtor data:

https://cre.moodysanalytics.com/insights/cre-news/one-good-y...