What significant piece of legislation aimed to protect the NYC skyline in 1961?

The significant piece of legislation that aimed to protect the NYC skyline in 1961 is the City’s Landmark Law. This law was enacted to preserve the architectural and historical significance of buildings and neighborhoods, ensuring that the unique character of the city was maintained against the pressures of development and modernization. The Landmark Law established a process for designating and protecting landmark buildings and historic districts, allowing the city to regulate changes that could detract from the skyline and overall historic integrity of its neighborhoods.

The introduction of this law played a crucial role in the evolution of urban planning in New York City, as it recognized the importance of preserving the cultural heritage of the city while accommodating urban growth. By focusing on protecting significant structures, the law helps to maintain a recognizable and cohesive skyline that is part of New York City's identity.

While other options may relate to urban development and zoning, none directly pertained to the specific legislative efforts aimed solely at protecting the skyline in this manner.