Thanks again - my brother got his MA in English Lit at NYU, and I've been in that neighborhood many times - but I did not know this. I figured there would be some sort of memorial there.
There is a small plaque on the side of the building. I believe it's on the Washington Place side, but I don't recall for certain.
Representatives of the International Ladies Garment Workers Union and the New York Fire Department mark the 63rd anniversary of the Triangle fire commemorated in 1974. Pauline Newman, (below the plaque) was an employee of the Triangle Shirtwaist Company.