emaar properties said on 9 june 2008 that construction of burj khalifa was slowed because of changes to finishes. an emaar official said that the luxury finishes that were decided on in 2004, when the tower was first planned, were being being replaced by better finishes. the design of the apartments were also made better. this was done to make them both look better and work better. there were problems with the marble decorations, flooring, the top floors' sanitation system, broken glasswork and a poorly done wall mural of the sultan of oman. a new ending date of 2 december, 2009, was then given. burj khalifa opened on 4 january 2010.