In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
One example: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Solution is here: Who believes Fagin's gang make wallets and handkerchiefs?.
Explanation: This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.

Now, solve this: 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.
Solution:
What is the name of the building whose foundation had been filled in during Soviet times to strengthen it?