How many floors does the building on 800 Boylston Street have?
CREATE TABLE "timeline_of_tallest_buildings" (
  "name" text,
  "street_address" text,
  "years_as_tallest" text,
  "height_ft_m" text,
  "floors" real
);
SELECT MAX("floors") FROM "timeline_of_tallest_buildings" WHERE "street_address"='800 boylston street';