Question: Which building, Olympic Tower or Latting Observatory, is no longer erect?
Sentence (from "Latting Observatory"): Conceived by Waring Latting and designed by architect William Naugle, the observatory was an octagonally-based, iron-braced wooden tower 315 ft high adjoining the Crystal Palace, with landings at three levels on the structure, allowing visitors to see into Queens, Staten Island and New Jersey.
Relevant evidence: No