The San Francisco League of Pissed Off Voters has things to say about London Breed (http://www.theleaguesf.org/#london) and Jeff Sheehy (same page, scroll down).
[1] "It's not supply.": https://twitter.com/JaneKim/status/573509389342019584
[2] "Data shows housing price go up & down with average wage not demand.": https://twitter.com/janekim/status/573510846233640960
[3] https://www.vox.com/cities-and-urbanism/2018/2/23/17011154/s...