Deconstruction is the downgrading of a building. Deconstruction happens one level at a time. Structures on a Colony or Moon can be deconstructed by clicking on that structure from within the Buildings section. Resources must be spent to remove a building, and the deconstruction takes a certain amount of time to complete. Not only do you not get any points for the resources spent on deconstructing, you also lose points from your score for all the points that that structure was worth.