The credit language reads: Design at least 50% of interior nonstructural walls, ceilings, and floors to be movable or demountable

What classifies a ceiling as a demountable ceiling? Would this only include ceiling clouds? Or does this also include an Armstrong ACT, for example, where the tiles can be taken down and reused? Or does the grid it sits in NOT make it demountable? Secondly, can open ceilings be considered demountable? Part of the demountable goal is flexibility, and open ceiling provide total flexibility, so in a floor plate where there is 50% open ceilings, and 50% ACT, it's hard to define the line between what is demountable and not