Translation:There are a lot of stores on the first floor.
It's the same thing with responses such as, "I wrote the same thing as your correct answer, but DL marked me wrong." Chances are, you did NOT write the SAME thing. I often think DL has run amok, but when I look closely I find there was some sort of typo that did indeed make my response incorrect.
I think it depends on the context. I might be wrong, but it seems to me that much, or even most, of the Spanish-speaking world follows the European model. Of course, there are many Spanish speakers in the US, in which case they would probably be referring to what Europeans would call the ground floor. (If they were in Asia - and yes I have heard people speaking Spanish in Asia - and following local customs they would also be referring to the ground floor.)