Which fire led to significant improvements in laws for high-rise occupancies?

The selection highlighting the Brooklyn Theatre Fire (1876), Triangle Shirtwaist Fire (1911), and Iroquois Theater Fire (1903) is significant because each of these events exposed critical vulnerabilities in the safety regulations pertaining to high-rise buildings and assembly occupancies.

The tragic outcomes from the Triangle Shirtwaist Fire, particularly, highlighted the dire need for improved fire safety measures in multi-story buildings, as workers found themselves trapped due to locked doors and inadequate escape routes. This disaster directly influenced changes to fire codes, including the implementation of stricter building regulations, the installation of fire escapes, and the establishment of fire drills in workplaces.

The Iroquois Theater Fire similarly showcased the dangers associated with large public gatherings in theaters, resulting in stricter safety statutes governing occupancy limits and emergency exits.

These events collectively led to an era of reform in fire safety laws, especially in relation to high-rise structures and large assembly buildings, emphasizing the need for modern safety regulations to prevent similar tragedies in the future. Thus, this answer rightly reflects a historically significant moment that initiated numerous legislative improvements in fire safety standards.