Question: What was César Pelli who designed the Marriott at Key Center influential for?

Context paragraphs:
Wells Fargo Center (Minneapolis): The Wells Fargo Center (90 South 7th St), formerly known as Norwest Center, is the third-tallest building in Minneapolis, Minnesota, after the IDS Center and the Capella Tower.  Completed in 1988, it is 774 feet (235.6 m) tall.  For many years, this was believed to be one foot shorter than Capella, but that structure actually had a different height (see the IDS Center article for details).  Norwest Center was designed with a modernized art deco style by César Pelli, reflecting nearby structures such as the nearby CenturyLink Building and the Foshay Tower, which is several blocks away.  It is also considered by many to be a homage to the Comcast Building at New York City's Rockefeller Center.

César Pelli: César Pelli, founder of Pelli Clarke Pelli Architects, is an Argentine American architect who has designed some of the world's tallest buildings and other major urban landmarks.  Some of his most notable contributions include the Petronas Towers in Kuala Lumpur and the World Financial Center in New York City.  The American Institute of Architects named him one of the ten most influential living American architects in 1991 and awarded him the AIA Gold Medal in 1995.  In 2008, the Council on Tall Buildings and Urban Habitat presented him with The Lynn S. Beedle Lifetime Achievement Award.

The Investment Building: The Investment Building is a high-rise office building in Washington, D.C. The building rises 13 floors and 154 ft in height.  The interior renovation and redesign of the building was by architect César Pelli; Pelli also designed the Petronas Twin Towers in Kuala Lumpur.  The renovation was completed in 2001.  As of July 2008, the structure stands as the 32nd-tallest building in the city, tied in rank with 1310 G Street, 1430 K Street, 1875 K Street, the Westin Washington, D.C. City Center, the Executive Tower, 1701 Pennsylvania Avenue the Capital Hilton and The Westin Washington, D.C. City Center.  The building is composed entirely of commercial office space.

Bucksbaum Center for the Arts: The Bucksbaum Center for the Arts is part of Grinnell College, located in Grinnell, Iowa.  The center was completed in May 1999, and actually contains the old Fine Arts complex.  The center was designed by renowned architect César Pelli.

Key Center North Tower: Key Center North Tower is a high-rise located in Buffalo, New York, USA.  It is the eighth tallest building in Buffalo at 275 feet (85 m) and 17 stories tall.  The building has a twin tower next door.  The Key Center South Tower which is four stories shorter and connected by a two-story glass atrium encompassing 18,800 square feet of retail space.  The complex is known as the Key Center at Fountain Plaza.  Both buildings have distinctive pyramid tops that are trimmed with bright green neon lighting which is illuminated at night.  In the front of the two towers is a large fountain in the summer.  In the winter, it serves as an outdoor ice rink that is free to the public.

Key Tower: Key Tower is a skyscraper on Public Square in downtown Cleveland, Ohio.  Designed by architect César Pelli, it is the tallest building in the state of Ohio, the 26th-tallest in the United States, and the 165th-tallest in the world.  The building reaches 57 stories or 947 ft to the top of its spire, and it is visible from up to 20 mi away.  The tower contains about 1.5 million square feet (139,355 m²) of office space.

Maryland Residence: The Maryland Residence is a private home in Bethesda, Maryland, United States, designed by César Pelli.  Completed in 1989, it is one of the few houses by an architect known mainly for his large commercial projects.  It takes the form of five small pavilions centrally connected.  Pelli has described it as a complex.

777 Tower: 777 Tower (also known as Pelli Tower) is a 221 m , 52-story high-rise office building designed by César Pelli located at 777 South Figueroa Street in the Financial District of Downtown Los Angeles, California.

Aronoff Center: The Aronoff Center is a large performing arts center in downtown Cincinnati, Ohio.  Events that can typically be found at the Aronoff Center include: plays, ballet, popular music concerts, stand-up comedy shows, and musicals.  The center was designed by renowned architect César Pelli and named in honor of Cincinnati native and Ohio senator Stanley Aronoff.

Marriott at Key Center: The Marriott at Key Center is a skyscraper hotel in Cleveland, Ohio.  The building rises 320 feet (98 m).  It contains 28 floors, and was completed in 1991.  The Marriott at Key Center currently stands as the 17th-tallest building in the city.  The architect who designed the building was César Pelli, who also designed the neighboring Key Tower, the tallest building in the city and the state.  The Marriott at Key Center closely resembles the façade of the Key Tower.  These two buildings, together with the Society for Savings Building, comprise Key Center.

Supporting paragraphs: Marriott at Key Center César Pelli
Answer: tallest buildings