What year was the building with a top 3 rank and a height of 274 (84) ft (m) completed?
CREATE TABLE "skyline" (
  "rank" real,
  "name" text,
  "height_ft_m" text,
  "floors_stories" real,
  "year_completed" real
);
SELECT MAX("year_completed") FROM "skyline" WHERE "rank"<3 AND "height_ft_m"='274 (84)';