The Federation Tower () is a complex of two skyscrapers built on the 13th lot of the Moscow International Business Center in Moscow, Russia. The two skyscrapers are named Tower East or Vostok (Russian: Восток; literally means "East") and Tower West or Zapad (Russian: Запад; literally means "West"). The supertall skyscraper Tower East (Vostok) is currently the second-tallest skyscraper in Europe and Russia after the Lakhta Center, the tallest building in Moscow, and the 55th-tallest building in the world. Zapad is a shorter skyscraper than Vostok and is the eleventh-tallest building in Russia, and the 22nd-tallest building in Europe. The complex stands on the 13th lot, which has an area of 439,154 square meters. The project was conceived by German-Russian engineer Sergei Tchoban and German professor and engineer Peter Schweger. The complex was designed by architecture companies nps+partner and Schweger Associated Architects. The complex started construction in 2005, with Zapad completed first in 2008 with a height of . As a result of the Great Recession, construction of the complex stopped until August 2011, and Vostok was completed on 7 December 2017 with a height of 374 meters (1,227 feet). In late 2014, Vostok surpassed the South Tower of OKO, which it is also part of the MIBC, as the tallest skyscraper of Russia and Europe. A spire was to be also built which would have extended the complex's height to as well as provided an observation deck but it was never completed and was dismantled afterward. The complex is owned by the AEON Corporation, a Russian private international investment group. The complex consists of two towers built on one podium. Tower East is a 97-story structure and Tower West is a 63-story structure. Tower East Planning and early development The higher tower of the complex located in the eastern part of lot number 13 was formerly known as Tower "A". But in November 2006, to avoid name competition with Naberezhnaya Tower, it was renamed Tower "Vostok (East)". Tower East is designed to have 95 above-ground and 3 underground floors, and 17 high-speed elevators will be installed there (JP. Kocher). According to the company Potok, which is the builder of the tower, it used grade B90 concrete which is twice as strong as regular concrete and will allow the skyscraper to withstand a direct hit of an aircraft. In early December 2009, the Potok Corporation management (ex-Mirax Group) announced that