CREATE TABLE table_71383 ("Name" TEXT, "Street address" TEXT, "Years as tallest" TEXT, "Height ft / m" TEXT, "Floors" FLOAT)

Name the years as tallest when floors are larger than 18
SELECT "Years as tallest" FROM table_71383 WHERE "Floors" > '18'
SELECT "Years as tallest" FROM "table_71383" WHERE "Floors" > '18'