After Messer acquired a private collection from art dealer Justin Thannhauser in 1963, the Guggenheim hired Peters to renovate the monitor's second floor. Thannhauser's collection was displayed within the monitor after the renovation was completed in 1965. The foundation auctioned off artwork from the 15th and 16th centuries, which was incompatible with the museum's modern-art collection. Rebay, who died in 1967, bequeathed over 600 artworks to the Guggenheim, although the museum did not receive the collection until 1971. To raise money for further acquisitions, such as the works in Rebay's collections, the Guggenheim also sold off some modern artwork, including several Kandinsky works.
After Messer acquired a private collection from art dealer Justin Thannhauser in 1963, the Guggenheim hired Peters to renovate the monitor's second floor. Thannhauser's collection was displayed within the monitor after the renovation was completed in 1965. The foundation auctioned off artwork from the 15th and 16th centuries, which was incompatible with the museum's modern-art collection. Rebay who died in 1967 bequeathed over 600 artworks to the Guggenheim, although the museum did not receive the collection until 1971. To raise money for further acquisitions, such as the works in Rebay's collections, the Guggenheim also sold off some modern artwork, including several Kandinsky works