The Sheraton Waikīkī Hotel, at 2255 Kalakaua Ave, opened in 1971. Today it is owned by and acts as the corporated headquarters of Kyo-Ya Company Limited, a subsidiary of Kokusai Kogyo Company Limited established by the brothers Kenji Osano and Masakuni Osano who bought the Hawaiian holdings fo the Sheraton Corporation in 1974. When built, 29-floor, 315-foot floor Sheraton had 2,000 rooms but after renovations, now has 1,695.
Diamond Head is the popular name of a volcanic tuff cone at the eastern end of Waikiki. It is known to Hawaiians as Lē'ahi, from the word lae which means 'brow' plus ahi which means 'tuna', because the its ridgeline resembles the a tuna's dorsal fin. Its English name was given by British sailors in the 19th century, who mistook calcite crystals embedded in the rock for diamonds. Diamond Head is part of the Honolulu Volcanic Series, a complex of cones, vents, and their associated eruption flows from the Ko'olau Volcano that took place long after the volcano formed and had gone dormant. While the Koʻolau Range is about 2.6 million years old, Diamond Head was estimated to have formed around 300,000 years ago from one single brief eruption. The symmetrical crater measures 3,520-feet in diameter with a 760-foot summit, covering 360 acres.