Hi. Interesting question.
It is hard to tell for 100% but looking at the US News class of 2020, their lowest 10% was 700 (thier 90th% was 760). seeems a very tight of a range but it is Columbia.
Looking at GMAT Club's records in the
decision tracker:
https://gmatclub.com/forum/decision-tra ... program=15 the lowest I saw was 650. (the link is ONLY FT CBS Admitted applicants and excludes dings, WL, and EMBA).
The Stern scores are similar. I did see a lone 620 on the Stern list.
P.S. I did see some people with low GRE scores (think GRE provides a much better option for the lower-GMAT but high potential candidates like you). Do you have time to take a shot at GRE?