"Wouldn’t all Hampton Inns built around this time be suspect?"
Mayybbeeeee.
Looking at the "after" picture:
I can see spots of "glue" on the upper surface of a lot of the sheetrock. This implies that SOME of the sheetrock was glued directly to the concrete ceiling.
I also see wood framing BELOW that sheetrock. That is, from the top, we have concrete, sheetrock, framing, more sheetrock.
I believe this room had a full sheetrock ceiling glued up to the concrete--wall to wall. Then the soffits were built underneath.
I see a lot of "nails" protruding from a 2x4 over on the middle left. I believe that 2x4, and others, was "nailed" up onto the sheetrock/concrete ceiling, further framing was installed to define the soffit, and then sheetrocked itself.
What those "nails" were is of interest. They clearly pulled out.
And the glue didn't do much to keep the top layer of sheetrock on the concrete, did it?
It does not appear that there were any hangers cast into the concrete.
It's quite possible that the soffit was an afterthought.
spsalso