Thanks for your response, I suppose my only issue with adding an IF statement is that the Asset layer, the one I'm attempting to get Facility info into, currently doesn't have FloorNumber field in it. I was attempting to make it as simple as possible so my Staff doesn't have to think about it.

Ideally, when the paired feature classes are turned on in the Web Application (IE: Facilities of City Hall Floor 1 & Assets of City Hall Floor 1) as a grouped Feature Service. When you add a new Asset, it reads the Facilities Room and adds it to the location field.

You may be correct where I have to preload the Asset with that Floor level to get the Attribute rule to identify its location.