county: county name in Polish. Check county_names() function.
TERYT: county ID (4 characters)
LOD: level of detail for building models ("LOD1" or "LOD2"). "LOD1" is default. "LOD2" is only available for ten voivodeships (TERC: "04", "06", "12", "14", "16", "18", "20", "24", "26", "28"). Check voivodeship_names() function.
outdir: (optional) name of the output directory; by default, files are saved in the working directory
unzip: TRUE (default) or FALSE, when TRUE the downloaded archive will be extracted and removed
...: additional argument for utils::download.file()
Returns
models of buildings in Geography Markup Language format (.GML)