This is interesting! I've been tracking info in a spreadsheet and this is the first time I've seen an anomaly between buildings.
I stayed in room 7458 and it was a shower only. With room 4458 being a tub-shower combo it means that the same room in a different building can have a different bathroom layout. Too bad! I was really hoping we'd see consistencies between buildings.
For example, rooms 0448, 6448 and 7448 all have tubs. I was hoping that this would mean all 4th floor rooms '48' would have tubs but we can see from the example above that this assumption cannot be made. Too bad!!
I will continue to analyze as further information comes in. Thanks to all who are sharing their experiences here.