Maslak "Spine Tower" which reaches a structural height of 202 meters; while the tallest skyscraper currently under construction in Maslak (as well as Istanbul and the rest of Turkey) is the Diamond of Istanbul, which comprises three centrally-connected towers, the tallest of which will have 53 floors above ground and will reach a structural height of 270 meters (thus surpassing the current tallest completed skyscraper in Istanbul, the 54-floor, 261 meters tall Istanbul Sapphire in the nearby Levent business district.) The Diamond of Istanbul will also be the first steel skyscraper in Turkey, where (as opposed to the situation in the
Osceola Commercial Historic District their architecture, which includes Italianate, Queen Anne, Neoclassical, Art Deco, and Mid-century modern styles. Significant buildings include the Arlington-Howe-Garner Hotel (1882), the United States Post Office (1935), the original city hall/fire station building, the Clarke County Courthouse (1956), and the water tower (1957). The Masonic Building (1872) is individually listed on the National Register. Osceola Commercial Historic District The Osceola Commercial Historic District is a nationally recognized historic district located in Osceola, Iowa, United States. It was listed on the National Register of Historic Places in 2018. At the time of its nomination, the district was composed of 42 contributing