The Empire State Building is a 102-story supertall skyscraper and a lasting cultural icon.

Context: Core term: Art Deco

Its Manhattan placement is on Fifth Avenue between 33rd and 34th Streets, shaping access and even its assignment.

Context: Site context concept: ZIP code assignment

Construction started on March 17, 1930, was topped out on September 19, 1930, and was completed on .

Context: Construction timeline fact

The tower’s massing is organized into base, shaft, and capital sections, producing a symmetrical, column-like silhouette typical of architecture.

Context: Architecture concept: Art Deco form

A is a step-back in a building’s massing that reduces the upper-floor footprint relative to lower floors.

Context: Key term: Setback

required buildings to step back so sunlight could reach street levels.

Context: Key term: 1916 Zoning Resolution

The 1916 Zoning Resolution required buildings to step back to allow sunlight to reach streets, which leads to that shape a uniform tower silhouette.

Context: Cause→effect relationship: zoning → mandated setbacks

The building’s facade is clad in panels that help produce its signature blonde color.

Context: Key term: Indiana limestone

The building’s total height includes its antenna , which extends the structure’s height beyond the roof.

Context: Key term: Spire (pinnacle)

The spire was originally equipped with white searchlights, which allowed the building to signal major events such as Roosevelt’s victory over Hoover in .

Context: Lighting history fact

In 1956, white searchlights were swapped for four “” lights.

Context: Key term: Freedom Lights

In 2012, metal halide lamps and floodlights were replaced with fixtures to expand color options.

Context: Key term: LED fixtures

Cause→effect: In 2012, metal halide lamps and floodlights were replaced with computer-controlled LED fixtures, which enabled far more color options (from nine to over 16 million) and dynamic effects that were previously impossible with plastic gels. This effect is driven by technology plus computer control.

Context: Cause→effect relationship: LED upgrade → expanded color range

The building’s public are on the 80th, 86th, and 102nd floors.

Context: Key term: Observatory floors

The Empire State Building was designated a U.S. on June 24, 1986.

Context: Key term: National Historic Landmark