When was the pentagon in WashingtonDC established?

Answer 1

The building was constructed in the early years of World War II in the space of only 16 months, and was completed on January 15, 1943 at a cost of roughly $83 million. Its construction managed the consolidation of 17 buildings belonging to the War Department, and required 5.5 million cubic yards of earth, 41,492 concrete piles, as well the dredging of 680,000 tons of sand and gravel into 435,000 cubic yards of concrete. The building was constructed in the early years of World War II in the space of only 16 months, and was completed on January 15, 1943 at a cost of roughly $83 million. Its construction managed the consolidation of 17 buildings belonging to the War Department, and required 5.5 million cubic yards of earth, 41,492 concrete piles, as well the dredging of 680,000 tons of sand and gravel into 435,000 cubic yards of concrete.