The underlying principle is incremental upzoning. By rezoning neighborhoods to just the next incremental higher density level (Single family homes to duplexes,

The underlying principle is incremental upzoning. By rezoning neighborhoods to just the next incremental higher density level (Single family homes to duplexes, triplexes, SFH+ADU), you allow for housing supply growth in a way that doesn't rapidly change the neighborhood character, and incentivizes households to participate in the growth, rather than just large developers. It also can result in a more stable appreciation of land values than going from SFH zoning to large apartment zoning. See: https://www.strongtowns.org/journal/2017/12/12/the-power-of-growing-incrementally-series https://www.strongtowns.org/journal/2017/12/12/the-power-of-...