[
  {
    "id": "H1",
    "title": "\"Harry Helmsley\", Nation's Business (interview at 71), pages 55 to 58",
    "url": "https://archive.org/details/Nations-Business-1980-10",
    "date": "October 1980"
  },
  {
    "id": "H4",
    "title": "Empire State Building Associates, prospectus (transcription on EmpireStateBuildingInvestors.com)",
    "url": "https://www.empirestatebuildinginvestors.com/1961-empire-state-building-associates-prospectus.html",
    "date": "31 October 1961"
  },
  {
    "id": "H5",
    "title": "Empire State Realty Trust, IPO prospectus (424B4)",
    "url": "https://www.sec.gov/Archives/edgar/data/1541401/000119312513389145/d283407d424b4.htm",
    "date": "October 2013"
  },
  {
    "id": "H12",
    "title": "Empire State Building: official history",
    "url": "https://www.esbnyc.com/about/history",
    "date": "History reviewed October 30, 2026"
  }
]