What's the name of the building where the "Horse" sculpture from the picture is located?

Horse (Czech Kůň) is a sculpture of the Czech artist David Černy made in 1999, located in Lantern Palace, Wenceslas Square 38, Prague. The Palace was built by Vácslav Havel, the grandfather of Václav Havel, the later president of the Czech Republic. This statue is supposed to symbolize the Czech tolerance to touching their delicate national subjects and the high level of Czech autoirony. The statue's installation was supported by the Palace's owner and Václav Havel's sister-in-law, Dagmar Havlová.