After the New York Meteorological Observatory automated its equipment and moved its offices to Rockefeller Center in the 1960s, Belvedere Castle was closed to the public and became an object of much vandalism, neglect and deterioration.
Setelah New York Meteorological Observatory pindah ke Rockefeller Center pada akhir 1960-an, Belvedere Castle ditutup untuk umum dan menjadi objek vandalisme, terabaikan dan rusak.