General Discussion

"Pew researchers found that modern four- to six-story single-stairway apartment buildings can be as safe as other residential buildings when they include fire-safety features such as sprinklers, smoke detectors, code-compliant drywall, self-closing doors and protected stairways.

Horowitz said Pew researchers counted every fire death in New York City and Seattle — two cities that have long allowed single-stairway apartment buildings — over 12 years.

In New York City, Pew identified 4,440 modern single-stairway buildings and found their fire-death rate was the same as other residential buildings — about five deaths per million occupant-years. Pew also found that the deaths it identified in modern single-stair buildings appeared to occur in the unit where the fire started, not because smoke or fire penetrated the single stairway."

The changes like a single staircase would be for new construction so getting the advantage of other advances. If the second staircase is necessary why doesn't the data show it hasn't saved any lives?