Table: tallest_buildings_michigan_2
Columns: name
city
height_feet_m
year
period
surpassed_by

Question: What was the period for 1896?
SQL: SELECT "period" FROM tallest_buildings_michigan_2 WHERE "year" = 1896

Question: Tell me the height which has a surpassed by of book tower
SQL: SELECT "height_feet_m" FROM tallest_buildings_michigan_2 WHERE "surpassed_by" = 'book tower'

Question: I need the surpassed for years before 1925 and period of 6 years
SQL: SELECT "surpassed_by" FROM tallest_buildings_michigan_2 WHERE "year" < 1925 AND "period" = '6 years'