Task: Question Generation
Input (English): Passage: During the time of the restoration, conducted by UkrNIIProektRestavratsiya and headed by Natalia Kosenko, the workers unearthed the whole lower floor, which had been filled in during Soviet times to strengthen the building's foundation. Restoration of the elaborate decor of the interior had to be fully redone. In the courtyard, the restorers placed an artificial lake, fountains, and a miniature garden—all of which had been in Horodecki's original plans.The building was opened as a filial "Masterpieces of Ukrainian Art" of the National Museum of Arts in November 2004. It was expected that the building would serve a dual purpose as a museum and as the presidential meeting place for state visitors. In April 2005, the Kiev City Council submitted a bill for 104 million hryvnias (approx. US $20 million) to the Ukrainian Government for reconstruction and restoration of the House with Chimaeras. The Council also allowed the Ukrainian government to construct a new square (closing off all automobile traffic) in front of the building for use in official ceremonies.Since May 2005, the building has been an official presidential residence, used for official and diplomatic ceremonies. The House with Chimaeras was used as a meeting place between Ukrainian President Viktor Yushchenko and Russian President Vladimir Putin, when the latter visited Kiev on December 22, 2006. Included in the building are rooms for negotiations, tête-à-tête talks, the signing of official documents, as well as a special room for the press.
Output (English): What is the name of the building whose foundation had been filled in during Soviet times to strengthen it?