Editing Singer Building (section)

===Form===
[[File:SingerBuilding2.jpg|thumb|left|upright|alt= Photograph of the Singer Building as seen from Broadway |The Singer Building seen from Broadway, looking north from the [[Equitable Building (Manhattan)|Equitable Building]], September 1967]]
The base of the building filled the entire lot. It was composed of the 10-story original structure (later expanded to 14&nbsp;stories) and the 14-story annex known as the Bourne Building.<ref name="LC p. 355" /> The original Singer Building, on the southeastern portion of the lot, had a frontage of {{Convert|58|ft||abbr=}} on Broadway and {{Convert|110|ft||abbr=}} on Liberty Street. The Bourne Building, on the southwestern portion, was 58&nbsp;feet deep and had a [[frontage]] of approximately {{Convert|75|ft||abbr=}} on Liberty Street.<ref name="Semsch p. 10">{{harvnb|Semsch|1908|ps=.|p=10}}</ref> From 1906 to 1907, the original Singer Building was extended northward and the Bourne Building was extended westward.<ref>{{harvnb|Semsch|1908|ps=.|pp=10–11}}</ref> The original Singer and Bourne buildings were about {{Convert|200|ft||abbr=}} tall.<ref name="nyt19070825">{{Cite news|date=August 25, 1907|title=Already Highest Structure in the World; Yet the Colossal New Singer Building Will Rise One Hundred Feet, Or Eight Stories, Higher When Completed Its Gigantic Steel Tower Will Dwarf City's Famous Skyscrapers to Insignificance.|language=en-US|work=The New York Times|url=https://www.nytimes.com/1907/08/25/archives/already-highest-structure-in-the-world-yet-the-colossal-new-singer.html|access-date=August 14, 2020|issn=0362-4331|archive-date=March 11, 2018|archive-url=https://web.archive.org/web/20180311221855/https://www.nytimes.com/1907/08/25/archives/already-highest-structure-in-the-world-yet-the-colossal-new-singer.html|url-status=live}}</ref>

The 41-story tower above the northwest corner of the base was square in plan, with floor dimensions of {{Convert|65|by|65|ft|abbr=}}.<ref name="LC p. 355" /><ref name="HABS p. 92" /><ref name="ABM p. 429" /> When the [[dome]] and [[Roof lantern|lantern]] at the tower's pinnacle were included, the Singer Tower was the equivalent of a 47-story building.<ref name="LC p. 355" /><ref name="Ripley p. 9459" /> The tower was set back {{Convert|30|ft||abbr=}} behind the base's frontage on Broadway,<ref name="LC p. 355" /><ref name="HABS p. 92" /> and it filled only one-sixth of the total lot area.<ref name="Ripley p. 9459">{{harvnb|Ripley|1907|ps=.|p=9459}}</ref> There was a gap of {{Convert|10|ft||abbr=}} between the Singer Building's tower and the City Investing Building immediately to the north, which was built during the same time. The columns required to support the Singer Tower would have been too large to place atop the original Singer Building, so they were instead built in the northern portion of the lot.<ref name="nyt20120329" /> The tower had a [[Slenderness ratio|height-to-width ratio]] of 7:1, setting a record at the time of its completion.<ref name="AF 1967-08" /><ref name="Stern (1995) p. 1126">{{harvnb|Stern|Mellins|Fishman|1995|ps=.|p=1126}}</ref>