The Structure Top of the Space Needle – Aircraft Warning Beacon: 605 feet Observation Deck: 520 feet Revolving SkyCity Restaurant: 500 feet SkyLine Banquet Facility: 100 feet Pavilion entrance and SpaceBase Retail Shop: ground level Bottom of foundation: 30 feet below ground The Space Needle was built on a 120′ x 120′ lot formerly owned by the city of Seattle, which was sold to investors for $75,000 in 1961, just one year before the opening of the World’s Fair. There are 848 steps from the bottom of the basement to the top of the Observation Deck. During the construction of the Space Needle, it took 467 cement trucks less than 12 hours to fill the foundation hole (30 feet deep and 120 feet across); this was the largest continuous concrete pour ever attempted in the West. When the Space Needle was built in 1962 it was the tallest building west of the Mississippi River. The foundation weighs 5,850 tons and there are 250 tons of reinforcing steel alone (i.e., rebar) in the foundation. The Needle structure weighs 3,700 tons. The center of gravity for the Space Needle is 5 feet above the ground. The Space Needle is fastened to its foundation with 72 bolts, each 30 feet in length. The Space Needle sways approximately 1 inch for every 10 mph of wind. It was built to withstand a wind velocity of 200 miles per hour, doubling the 1962 building code requirements. When winds around the Needle reach high speeds, 35 mph or higher, the elevators are designed to reduce their traveling speed to 5 mph for safety reasons.
NOTE: Aside from this real estate listing, I can’t find anything else that verifies this is legitimate.
UPDATE: John L. Scott Real Estate has removed the listing without explanation.
via Ben Huh