What is the height in meters for a building in Frankfurt that is 850 feet tall?
CREATE TABLE "timeline_of_tallest_buildings" (
  "name" text,
  "city" text,
  "height_m" real,
  "height_ft" real,
  "floors" real,
  "years_as_tallest" text
);
SELECT "height_m" FROM "timeline_of_tallest_buildings" WHERE "city"='frankfurt' AND "height_ft"=850;