Watch the video player above for Carolyn Tyler's full report.
Click here for a look at more stories and videos about the Millennium Tower in San Francisco.
1st city hall hearing about the sinking Millennium Tower in SF. pic.twitter.com/3JqIZKMxDl— carolyn tyler (@ctylerabc7) September 22, 2016
Supervisor Peskin grills city officials about Millennium-"this isn't somebody's leaking toilet-this is a big deal" pic.twitter.com/E167qhiHAY— carolyn tyler (@ctylerabc7) September 22, 2016
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Click here to read the subpoena formally filed by San Francisco City Attorney Dennis Herrera.