This is the 14770th most frequent Polish word.
radcowskiego
The Polish word "radcowskiego" means "of the legal counsel" or "pertaining to the legal advisor."
Here, 'radcowskiego' is an adjective describing 'office' ('biura'). It denotes a relation to legal advisory services.
Zadzwoniłem do biura radcowskiego, aby umówić się na spotkanie.
I called the legal advisory office to schedule a meeting.
In this context, 'radcowskiego' modifies 'archiwum' ('archive'), indicating the archive's association with legal counsel matters.
Dokument pochodzi z akt radcowskiego archiwum.
The document comes from the legal counselor's archive files.
Here, 'radcowskiego' describes 'gabinet' ('room' or 'office'), specifying its purpose or owner within the legal advisory field.