My Indentation Style

SELECT
    CAST (COUNT(DISTINCT our.unique_id) AS FLOAT) / (SELECT COUNT(*) FROM our_Schools) * 100
FROM
    -- Our Schools
    (SELECT
        REPLACE(LOWER(st.abbr + sc.city + sc.district + sc.name), ' ', '') AS unique_id
    FROM
        dbo.our_Schools sc
        INNER JOIN States st
            ON sc.state = st.fips) our
    INNER HASH JOIN
    -- GS
    (SELECT DISTINCT
        REPLACE(LOWER(st.abbr + e.city + e.district_name + e.name), ' ', '') AS unique_id,
        e.universal_id
     FROM
        dbo.GS_Entities e
        INNER JOIN States st
            ON e.state_id = st.fips
     WHERE
        e.entity_id = 3 /* schools */) gs
        ON our.unique_id = gs.unique_id
    INNER JOIN dbo.GS_Census c
        ON gs.universal_id = c.universal_id
        AND c.data_type_id = 2 -- enrollment
        AND CAST(c.value AS INTEGER) < 600