CREATE TABLE table_27474 ("Team" TEXT, "Home city" TEXT, "Home ground" TEXT, "In Toppserien since" FLOAT, "First appearance" FLOAT, "Seasons" FLOAT)

What is the home city for the team whose home ground is dnb nor arena?
SELECT "Home city" FROM table_27474 WHERE "Home ground" = 'DnB Nor Arena'
SELECT "Home city" FROM "table_27474" WHERE "Home ground" = 'DnB Nor Arena'