etre followed by a preposition always?

Question

The text says "Note that in each case where être is the auxilliary, the verb passer is followed by a preposition (en, sur, dans, à etc.). "

But then we have the example "Elle est passée chez Laurent hier"

Surely "chez laurent" is a noun?

Accepted Answer

SR , 
‘ chez ‘ is a preposition, not an article/determiner.  It can be used in multiple contexts.
The structure in this example is the same as for the examples in the lesson using ‘ par ‘, for instance.
When there is a preposition directly following the verb passer, preceding the noun, there is no direct object, and the grammatical rule is that conjugation is with ‘ être ‘, as per the lesson ( this is in common with most, but not all, verbs that can conjugate with either ‘ être ‘ or ‘ avoir ‘ ).
 https://progress.lawlessfrench.com/revision/glossary/lexical-category-or-parts-of-speech/preposition 
https://progress.lawlessfrench.com/revision/grammar/how-to-say-at-someones-place-chez-prepositions 
https://www.wordreference.com/fren/passer
 https://www.wordreference.com/fren/chez