"Review of the Week". The Real Estate Record: Real Estate Record and Builders' Guide. Vol. 67, no. 1717. February 9, 1901. p. 234. Archived from the original on August 6, 2021. Retrieved August 9, 2021 – via columbia.edu.
"Review of the Week". The Real Estate Record: Real Estate Record and Builders' Guide. Vol. 67, no. 1722. March 16, 1901. p. 455. Archived from the original on August 6, 2021. Retrieved August 9, 2021 – via columbia.edu.
"452 Fifth Lobby Renovation". Kajima Building & Design Group Inc. August 7, 2019. Archived from the original on August 7, 2021. Retrieved August 6, 2021.
"Real Estate News". New York Daily Herald. January 3, 1920. p. 6. Archived from the original on August 6, 2021. Retrieved August 5, 2021 – via newspapers.com.
"His Hats Worn the World Over". New-York Tribune. May 8, 1900. p. 2. Archived from the original on August 6, 2021. Retrieved August 6, 2021 – via newspapers.com.
"Loft Space in Demand". New-York Tribune. April 14, 1909. p. 10. Archived from the original on August 6, 2021. Retrieved August 6, 2021 – via newspapers.com.
"Heckscher Buys 5th Av. Leasehold". New York Herald. January 8, 1922. p. 64. Archived from the original on August 6, 2021. Retrieved August 5, 2021 – via newspapers.com.
Chadwick, Bruce (September 22, 1981). "Bank headquarters slated for Fifth Ave". New York Daily News. p. 98. Archived from the original on August 6, 2021. Retrieved August 5, 2021 – via newspapers.com.
Shepard, Joan (February 15, 1985). "Landmark-eligible facade lost". New York Daily News. p. 160. Archived from the original on August 9, 2021. Retrieved August 9, 2021 – via newspapers.com.
"Knox Building". PBDW Architects. Archived from the original on August 6, 2021. Retrieved August 6, 2021.
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Slatin, Peter (December 11, 1994). "Back-office structure to rise on West 40th, south of Bryant Park". The New York Times. p. R7. ISSN0362-4331. ProQuest109314094.
McMorrow 1988, p. 80. McMorrow, Eileen (October 1988). "Landmark-Status Building Is Focal Point For Republic Bank". Facilities Design & Management. Vol. 7, no. 9. pp. 80–87. ProQuest216002102.
McMorrow 1988, p. 86. McMorrow, Eileen (October 1988). "Landmark-Status Building Is Focal Point For Republic Bank". Facilities Design & Management. Vol. 7, no. 9. pp. 80–87. ProQuest216002102.
McMorrow 1988, p. 83. McMorrow, Eileen (October 1988). "Landmark-Status Building Is Focal Point For Republic Bank". Facilities Design & Management. Vol. 7, no. 9. pp. 80–87. ProQuest216002102.
McMorrow 1988, p. 82. McMorrow, Eileen (October 1988). "Landmark-Status Building Is Focal Point For Republic Bank". Facilities Design & Management. Vol. 7, no. 9. pp. 80–87. ProQuest216002102.
McMorrow 1988, p. 85. McMorrow, Eileen (October 1988). "Landmark-Status Building Is Focal Point For Republic Bank". Facilities Design & Management. Vol. 7, no. 9. pp. 80–87. ProQuest216002102.
"Where to Find Knox Hats: a New Store at Fifth-ave. And Fortieth-st". New-York Tribune. October 12, 1902. p. A4. ProQuest571167547.
"A New Fifth-ave. Store: It Would Surprise Those Who Frequented Knox's "Hole in the Wall" in Fulton-st". New-York Tribune. October 1, 1902. p. 7. ProQuest571278072.
"Col. Kip's Old Home Changes Hands". New-York Tribune. April 2, 1901. p. 9. ProQuest570986854.
"Real Estate". New-York Tribune. May 30, 1901. p. 11. ProQuest570925211.
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"Heckscher's Big Realty Holdings: Holds Title to Eleven Big Office Buildings, Exceeding $30,- 000,000 in Value". The New York Times. August 5, 1923. p. RE1. ISSN0362-4331. ProQuest103194447.
"Industrialist Is Putting His Millions Into Gilt-Edge Real Estate; Holds Eleven Big Structures Valued at From $30,000,000 to $35,000,000". New-York Tribune. August 5, 1923. p. C1. ProQuest1237337842.
"Architect Leases Quarters On Madison Avenue: Electus D. Litchfield Rents Offices in Building at 57th Street; Other Leases". The New York Herald, New York Tribune. May 26, 1926. p. 36. ProQuest1113070099.
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"Radio Coneern Rents Quarters On 5th Avenue: Interstate Broadcasting Co. Takes Plaza Zone Space; Other Business Leases". New York Herald Tribune. August 5, 1936. p. 34. ProQuest1222112344.
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"Business Space Market Active In Many Zones: Doughty Advertising Firm Takes Lexington Avenue Floor; Restaurant Leases". New York Herald Tribune. October 31, 1934. p. 32. ProQuest1243787145.
"Many of City's 'New' Buildings Are Just Old Ones Redressed: Old Steel-Framed Buildings Are Stripped and Clad Anew". The New York Times. November 21, 1965. p. R1. ISSN0362-4331. ProQuest117021095.
Grant, Peter (May 2, 1994). "City set to fast-track Republic Bank addition". Crain's New York Business. Vol. 10, no. 18. p. 14. ProQuest219127264.
Caretsky & Herskovits 1997, p. 51. Caretsky, Bill; Herskovits, Zvi (July 1997). "Money in the bank". Consulting – Specifying Engineer. Vol. 22, no. 1. pp. 50–54. ProQuest220598056.
Caretsky & Herskovits 1997, p. 50. Caretsky, Bill; Herskovits, Zvi (July 1997). "Money in the bank". Consulting – Specifying Engineer. Vol. 22, no. 1. pp. 50–54. ProQuest220598056.
Caretsky & Herskovits 1997, p. 52. Caretsky, Bill; Herskovits, Zvi (July 1997). "Money in the bank". Consulting – Specifying Engineer. Vol. 22, no. 1. pp. 50–54. ProQuest220598056.
Krebsbach, Karen (June 2002). "HSBC Launches Brokerage Unit Next to Existing Manhattan Office". Bank Investment Marketing. Vol. 10, no. 5. p. 9. ProQuest209359951.
"HSBC Shops Fifth Avenue Tower". Real Estate Finance and Investment. September 1, 2008. ProQuest197822332.
"HSBC Opts Not to Sell". Real Estate Finance and Investment. October 6, 2008. ProQuest197821806.
"Bids In On HSBC Building". Real Estate Finance and Investment. June 29, 2009. ProQuest197831816.
"CMBS Funding Aids Investors' Gain on NYC's HSBC Tower". Dow Jones Institutional News. July 10, 2012. ProQuest2116096574.
"Plots & Ploys / Breaking News From WSJ.com's Developments Blog". Wall Street Journal. July 11, 2012. p. C8. ISSN0099-9660. ProQuest1024341732.
"Real Estate News". New York Daily Herald. January 3, 1920. p. 6. Archived from the original on August 6, 2021. Retrieved August 5, 2021 – via newspapers.com.
"452 Fifth Lobby Renovation". Kajima Building & Design Group Inc. August 7, 2019. Archived from the original on August 7, 2021. Retrieved August 6, 2021.
"His Hats Worn the World Over". New-York Tribune. May 8, 1900. p. 2. Archived from the original on August 6, 2021. Retrieved August 6, 2021 – via newspapers.com.
"Review of the Week". The Real Estate Record: Real Estate Record and Builders' Guide. Vol. 67, no. 1717. February 9, 1901. p. 234. Archived from the original on August 6, 2021. Retrieved August 9, 2021 – via columbia.edu.
"Review of the Week". The Real Estate Record: Real Estate Record and Builders' Guide. Vol. 67, no. 1722. March 16, 1901. p. 455. Archived from the original on August 6, 2021. Retrieved August 9, 2021 – via columbia.edu.
"Loft Space in Demand". New-York Tribune. April 14, 1909. p. 10. Archived from the original on August 6, 2021. Retrieved August 6, 2021 – via newspapers.com.
"Heckscher Buys 5th Av. Leasehold". New York Herald. January 8, 1922. p. 64. Archived from the original on August 6, 2021. Retrieved August 5, 2021 – via newspapers.com.
Chadwick, Bruce (September 22, 1981). "Bank headquarters slated for Fifth Ave". New York Daily News. p. 98. Archived from the original on August 6, 2021. Retrieved August 5, 2021 – via newspapers.com.
Shepard, Joan (February 15, 1985). "Landmark-eligible facade lost". New York Daily News. p. 160. Archived from the original on August 9, 2021. Retrieved August 9, 2021 – via newspapers.com.
Slatin, Peter (December 11, 1994). "Back-office structure to rise on West 40th, south of Bryant Park". The New York Times. p. R7. ISSN0362-4331. ProQuest109314094.
"Heckscher's Big Realty Holdings: Holds Title to Eleven Big Office Buildings, Exceeding $30,- 000,000 in Value". The New York Times. August 5, 1923. p. RE1. ISSN0362-4331. ProQuest103194447.
"Many of City's 'New' Buildings Are Just Old Ones Redressed: Old Steel-Framed Buildings Are Stripped and Clad Anew". The New York Times. November 21, 1965. p. R1. ISSN0362-4331. ProQuest117021095.