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Because of a newly painted façade, the whole building looks as if it has been reconstructed, although the rest is still in decay (castle brewery in Kolín, Czech Republic).
In politics and economics, a Potemkin village is a construction (literal or figurative) whose purpose is to provide an external façade to a situation, to make people believe that the situation is better than it actually is. The term comes from stories of a fake portable village built by Grigory Potemkin, a field marshal and former lover of Empress Catherine II, solely to impress the Empress during her journey to Crimea in 1787.
Potemkin village https://en.wikipedia.org/wiki/Potemkin_village
A more modern more accurate term would be "Matrix".