This is the 570th most frequent Armenian word.
քաղաքում
"In the city"
The word 'քաղաքում' (kaghakoom) is used here as a locative form, indicating the location where the subject lives, translating to 'in the city'.
Ես ապրում եմ քաղաքում։
I live in the city.
In this sentence, 'քաղաքում' (kaghakoom) functions as a setting descriptor, defining where the described attributes (beautiful buildings) are found.
Քաղաքում շատ գեղեցիկ շենքեր կան։
There are many beautiful buildings in the city.
Here, 'քաղաքում' (kaghakoom) specifies the context for the comparison, indicating where the food pricing condition applies.