Building of the Supreme Council of Crimea, Administrative building on Karl Marx Street in Simferopol, Crimean Peninsula.

The Building of the Supreme Council of Crimea is an eight-sided structure of Soviet modernism and brutalism, built around an inner courtyard that holds the entrance. It stands at 18 Yekaterininskaya Street, in the block between Yekaterininskaya, Zhukovsky, Gorky and Serov streets, next to Victory Square with the Alexander Nevsky Cathedral. Simferopol residents call it the Pentagon for its resemblance to the US Department of Defense headquarters.

Construction of this administrative complex began in 1980 on the site of a former children's cinema theater. The structure emerged as part of Soviet administrative development in the Crimean region.

Locals call the octagonal building "the Pentagon" for its resemblance to the US Department of Defense headquarters. Until 2014 the facade carried the body's name in Ukrainian, Russian and Crimean Tatar; on 17 March 2014 the Ukrainian inscription was replaced by "State Council of Republic of Crimea" on a white background.

The building stands at the intersection of Karl Marx Street, Gorky Street, and Zhukovsky Street in the city center. Its location makes it easy to find when moving through central Simferopol.

Locals call the octagonal building "the Pentagon" for its resemblance to the US Department of Defense headquarters. Since 2019 a multicoloured illumination lights its facade, which was cleaned in the same period. The council's own voting system, "Rada", had been in use since the early 1990s.