וְהַלְּשָׁכ֥וֹת הָעֶלְיוֹנֹ֖ת קְצֻר֑וֹת כִּֽי־יוֹכְל֨וּ אַתִּיקִ֜ים מֵהֵ֗נָה מֵֽהַתַּחְתֹּנ֛וֹת וּמֵהַתִּֽכֹנ֖וֹת בִּנְיָֽן׃
Now the upper chambers were shorter; for the galleries took away from these, more than from the lower and the middlemost, in the building.
Read midrashic interpretation of Ezekiel 42:5: and classical rabbinic exegesis.