'After a six year construction period, the Kingdom Tower opens in Jeddah, Saudi Arabia.' in 2017

Created by gwern on 2011-09-26; known on 2018-01-01; judged wrong by JoshuaZ on 2018-01-01.

• gwern estimated 40% on 2011-09-26
• gwern said “http://www.futuretimeline.net/21stcentury/2017.htm#kilometre-high-skyscraper WP records a really chaotic development process” on 2011-09-26
• JoshuaZ estimated 58% on 2011-09-27
• JoshuaZ estimated 42% and said “Oops that should be against. ” on 2011-09-27
• Robert Kosten estimated 30% on 2011-10-04
• themusicgod1 estimated 46% on 2016-10-09
• JoshuaZ said “Goal is now 2020 https://en.wikipedia.org/wiki/Jeddah_Tower ” on 2018-01-01
• JoshuaZ   judged this prediction wrong on 2018-01-01.