וַיִּשְׂרֹ֥ף אֶת־בֵּית־יְהוָ֖ה וְאֶת־בֵּ֣ית הַמֶּ֑לֶךְ וְאֵ֨ת כָּל־בָּתֵּ֧י יְרוּשָׁלִַ֛ם וְאֶת־כָּל־בֵּ֥ית גָּד֖וֹל שָׂרַ֥ף בָּאֵֽשׁ׃
Rashi on II Kings
And all the houses of the dignitaries. [This includes] synagogues wherein Torah and prayer are aggrandized, and the houses of the princes.5See Maseches Megillah 27a.
Ralbag on II Kings
even every great man's house: This means, "every great man's house."