CREATE TABLE table_56858 ("Name" TEXT, "City" TEXT, "Height  ( m ) " FLOAT, "Height  ( ft ) " FLOAT, "Floors" FLOAT, "Years as tallest" TEXT)

How high was the highest building in feet in the city of cologne?
SELECT MAX("Height (ft)") FROM table_56858 WHERE "City" = 'cologne'
SELECT MAX("Height (ft)") FROM "table_56858" WHERE "City" = 'cologne'