SELECT
bs.NAME AS SECTION_NAME
FROM
b_iblock_element_property bep
INNER JOIN b_iblock_element be ON bep.IBLOCK_ELEMENT_ID = be.ID
INNER JOIN b_iblock_section_element bse ON be.ID = bse.IBLOCK_ELEMENT_ID
INNER JOIN b_iblock_section bs ON bse.IBLOCK_SECTION_ID = bs.ID
WHERE
bep.IBLOCK_PROPERTY_ID = 105 AND bep.VALUE = 1545