Cleaner HQ is still the most Soul Eater looking place in all of Gachiakuta. Why? What are those pipes? Why do they go around the building? Why do they have giant nails in them and most importantly, why are the lamp posts shaped like that??
Of the top of my head I don't remember any other place on the Ground that is misshapen like this. But this brings me to recent manga revelations.
We got introduced to the 4 apostles whose symbols we've known for a while. But while Ophelia Amne is credited as the first Hell Guard, it's not her symbol that the Hell Guard use as their coat of arms. They use a fifth symbol that has to belong to a Giver of similar status to the 4 apostles because that Giver's jinki is still used to this day as the Hell Guard's equipment.
So my question is: is the Cleaner symbol the symbol of a sixth Giver from that time? The founder of the Cleaners? And does Cleaner HQ have weird architectural designs because a jinki power was involved in creating it?
Of course the biggest question that follows this theory is: where is the jinki of that sixth Giver from olden times? And could it be the building itself?