What is the home ground for the team whose home city is Trondheim with 27 seasons? 
CREATE TABLE "2013_teams" (
  "team" text,
  "home_city" text,
  "home_ground" text,
  "in_toppserien_since" real,
  "first_appearance" real,
  "seasons" real
);
SELECT "home_ground" FROM "2013_teams" WHERE "seasons"=27 AND "home_city"='Trondheim';