This is the 15529th most frequent Polish word.
starostwa
"Starostwa" refers to county offices or administrative districts in Poland.
Here, 'starostwo' refers to the administrative office of a local government (county office).
Znalazłem mapę w starostwie powiatowym.
I found a map at the county office.
In this usage, 'starostwo' signifies the institution itself carrying out administrative responsibilities.
Starostwo odpowiada za organizację transportu publicznego w regionie.
The county office is responsible for organizing public transport in the region.
Here, 'starostwo' refers to the physical building or location of the county office.