CREATE TABLE table_27473 ("Team" TEXT, "Home city" TEXT, "Home ground" TEXT, "In Toppserien since" FLOAT, "First appearance" FLOAT, "Seasons" FLOAT)

What is the home ground for the team whose home city is Trondheim with 27 seasons?
SELECT "Home ground" FROM table_27473 WHERE "Seasons" = '27' AND "Home city" = 'Trondheim'
SELECT "Home ground" FROM "table_27473" WHERE "Home city" = 'Trondheim' AND "Seasons" = '27'