I would love to have an 'upgrade all' button after you spend your points. If you buy points for better beds or showers, just 1 click and every item in your hotel gets upgraded. I would also at that to the tutorial, it took me a while to figure out I can just upgrade items by clicking on them. At first I deleted everything old and build the upgrades. Or maybe that was just me! 
#Upgrade all
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I absolutely agree with you
but I would suggest per room and not all in one
I would suggest upgrade select box like the delete/selling select box
What also is missing that it is possible to use the upgrade colour
true
Hey all @hybrid latch @hard geode @vague shuttle!
In today’s big New York update, we’ve added a new button: 'Upgrade all available items in this zone.' It should be a big help with your upgrading efforts 
You are amazing! 