[Acrylic-bob]

Ok, I think that I have got it. Goods In at the front of the building under the arch would be hoisted to whatever level and stored. There has to be some reason why the windows facing the canal are so large and level with the floor. The reason is because they were used for loading/unloading. the diagonal section of the corner is integral to the building and not a later addition so it was obviously intended to be there from the begining. And why put a lifting beam on a corner? It didnt make sense until I thought of it as a bracket beam which held a rotating rotating arm which could service two sides of the building. the diagonal section is to accomodate the thicker base which did not rotate. Sorry for the scrappy nature of the drawing, but trying to draw with a mouse is feindishly difficult.