This is the 385th most frequent Serbian word.
градска
"Градска" means "urban" or "city-related" in English.
Here, 'градска' is an adjective describing the library as belonging to the city or municipal.
Градска библиотека је веома опремљена.
The city library is very well equipped.
In this case, 'градска' is used to identify the tourism agency as being related to the city.
Градска туристичка агенција организује многе туре.
The city tourism agency organizes many tours.
Here, 'градској' is the dative case of 'градска,' modifying the noun 'улици' (street) as an attribute of the city.