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"Ludlow, Day & Co. Real Estate Sign on side of 54 West 31st Street, as seen from parking lot on southwest corner of 31st & Broadway, with 875 6th Avenue, northwest corner of 31st Street, behind" Village Preservation (GVSHP) Image Archive, accessed Oct 18, 2021, https://www.villagepreservation.org/ia_image/ludlow-day-co-real-estate-sign-on-side-of-54-west-31st-street-as-seen-from-parking-lot-on-southwest-corner-of-31st-broadway-with-875-6th-avenue-northwest-corner-of-31st-street-behind/.