WSVN TV reports that no cause has been established but everything is being considered including sinkholes, construction defects, terrorism, and current roof repairs. According to a Florida International University researcher interviewed by USA Today, the building has been sinking during the 1990s at a significant rate of about 2 mm/year. While 97% of Miami Beach had been stable, 1555 of 18,949 points in Miami Beach had been sinking, at rate of less than 1 mm/year.