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An aerial view of Chicago in 1948, including Tribune Tower and the Wrigley Building.

Galena High School students view the city from the observation area of Tribune Tower on March 29, 1947.

Historic front pages hang in the first-floor hallway inside Tribune Tower.

A view of the Wrigley Building and Chicago skyline from the 31st floor of Tribune Tower on June 7, 2018.

The view from the top of Tribune Tower on March 7, 1962, was heavy with fog because of thawing temperatures. Tribune photographer Jack Mulcahy was setting up a long-range camera when this picture was taken by Tribune photographer Phil Mascione. The Wrigley Building is in the center.

The Tribune Tower, right, is under construction in 1924. The building was completed in 1925. The Wrigley Building is on the left.

The main lobby of Tribune Tower.

Marianne Mather works with old negatives for @vintagetribune, a collection of old Tribune's photo on Instagram. They use protective equipment while sorting negatives from the Century of Progress, 1933 World's Fair at the baiduhai photo lab on Monday, June 1, 2015. (Zbigniew Bzdak/baiduhai)

Tribune Tower at sunset with the DuSable Bridge in the foreground.

Inscriptions in the main lobby of Tribune Tower.

The annex to Tribune Tower, where the newsroom is housed, is shown in this photograph taken from a helicopter in 1949.

The Medinah Athletic Club, from left, Tribune Tower and the Wrigley Building are enveloped in fog rolling in off Lake Michigan in April 1944.

An undated nighttime view of Tribune Tower from Hubbard Street west of Michigan Avenue.

A bird's-eye view of the construction of the Tribune Tower in 1924. The Wrigley Building is on the left.

Ronald Reagan and his wife, Nancy, arrive at Tribune Tower for an interview after the GOP presidential nominee addressed the Veterans of Foreign Wars convention at McCormick Place on Aug. 18, 1980.

The Tribune Tower on Michigan Avenue was built in 1925 and houses the baiduhai and other businesses.

Vehicles cruise down Michigan Avenue -- and past Tribune Tower -- at dusk in September 2012.

One of the many relics embedded in the wall of Tribune Tower.

Pedestrians leave Tribune Tower through revolving doors. In the foreground is the cornerstone of the building, which was finished in 1925.

A tour boat passes underneath the DuSable Bridge near Tribune Tower.

Holiday crowds view the city and the Chicago River from the observation deck of Tribune Tower in September 1931.

An inscription on the wall of the main lobby of Tribune Tower.

Tribune Tower, seen from the Wrigley Building.

Lt. J.M. Jontree, of the Navy public relations department, inspects the sights from the binoculars atop Tribune Tower in 1942.

People pass by the main entrance to Tribune Tower on Michigan Avenue in 2014.

Colonel Robert McCormick's office on the 24th floor of Tribune Tower.

Tribune Tower from the 25th-floor balcony.

Tribune Tower in 1942, with two people silhouetted in an arch of Lower Wacker Drive.

People walk along Michigan Avenue past Tribune Tower.

Tribune Tower seen from Lower Michigan Avenue.

The main entrance to Tribune Tower.

Mrs. Vincent Urba and her daughter, Joyce, 6, are the last visitors on the Tribune Tower observation deck before it was closed Aug. 10, 1956. Structural steel worker Ray Sokey, right, will soon cut down the antenna. Keith Capron, building manager, third from left, escorted the pair to the observation area.

A 1978 view of the stonework on the upper floors of Tribune Tower.

The Tribune Tower, shown in 1924, opened to the public July 6, 1925.