There are artifacts on the model. They were never there a few moments before reaching this stage. I made sure no objects were inside another object and carefully placed the objects accurately side by side to build the model. I would really appreciate any attempt at helping me solve this problem. I really want to wrap this section up with this model before moving on to the next section. Below are attached images and the blender file. Thank you.
This is the attached blender file (zipped):MoneyHeistBuilding.zip (747.6 KB)