Building class: What makes a Building an A class

[Dulce Beltran]

Hey BP! Am looking into commercial residential and want to know the differences between a class A, B, C buildings. Besides the ubiquitous letter grade, what actually makes the building class a C vs an F aka a war zone? I’m sure it’s location, amenities, proximity, tenants, transportation, population, crime, etc. Is there a specific list I can use as a guide?