Trickle down housing

From HousingWiki

Trickle down [housing] is a pejorative characterization of support for higher-end market-rate housing, or the idea that such housing can benefit lower-income households. Present usage is probably by analogy to the pejorative term "trickle-down economics" used to describe Reagan's economic program. 

We've found usage of "trickle down," to describe what's later called filtering down of housing (see Filtering) as far back as 1939, & a burst of usage around end of WWII when post-war housing shortages + remedies were being discussed by policymakers. See: