Both, multypoligon 14500792 and way 312363760, which was an outer member of the multypoligon were tagged as building=yes. This "building inside building" mapping did not look appealing to me, so I opted to delete the multypoligon and keep the way for the outline of the center. Now inside the outline, there are two ways tagged building:part. One of them, 1088985008 you have created and the smaller one, 1238723239 I added so that these two parts cover the entire outline. Such mapping is described at https://wiki.openstreetmap.org/wiki/Simple_3D_Buildings The structure aside, another messy part that is in the news is that Cole's center is probably out of business by now.