New York State Legislature’s passage of the new Tenement House Act of 1901. While this act did not officially ban the construction of tenements on twenty-five-foot-wide lots, it made it difficult to efficiently plan such buildings. Most new law tenements were built on lots with a width of thirty-five feet or more. As required by the law, these tenements had larger, if still relatively small light courts and occupied somewhat less of the total lot area. The new law mandated that all rooms have windows and each apartment have its own toilet facilities. Another important aspect of the law was its impact on older tenement buildings. The law mandated a series of changes designed to address the dangerous and unsanitary conditions in these pre-existing tenements. Changes included improved lighting, banning second windowless interior rooms (a provision later rescinded), and requiring the addition of one toilet for every two families.
This is when the 1901 legacy was finally passed.