How many floors are in the 274 (84) ft (m) building that is ranked number 1?
CREATE TABLE "skyline" (
  "rank" real,
  "name" text,
  "height_ft_m" text,
  "floors_stories" real,
  "year_completed" real
);
SELECT AVG("floors_stories") FROM "skyline" WHERE "height_ft_m"='274 (84)' AND "rank">1;