Montwiłł also financed the creation of a Polish school in Vilnius (1907), a city hall in Panevėžys; built already after his death, and the Polish Theatre in Vilnius (in modern times converted to Russian Dramatic Theatre of Lithuania).
Montwiłł supported the establishment of a Polish school in Vilnius (1907), a city hall in Panevėžys, built after his death, and the Polish Theatre in Vilnius, which was later converted to the Russian Dramatic Theatre of Lithuania.