The CEO of the world's largest architecture firm reveals her favourite buildings of all time

GenslerThe Gratz Center at the Fourth Presbyterian Church in Chicago, Illinois.

As the world’s largest architecture firm, Gensler has been the guiding hand behind tens of thousands of masterplans and buildings — including New York City’s JFK Airport and Facebook’s London headquarters — since its founding in the 1960s.

Around the world, the company has more than 2,500 architects working on design projects, including a $US600 million redevelopment of Chicago’s oldest post office.

In an interview with Business Insider, Gensler co-CEO Diane Hoskins shared three of her favourite pieces of architecture of all time — two of which happen to be Gensler buildings.

Check them out below.

Hoskins said she loves how the Tower at PNC Plaza in Pittsburgh, Pennsylvania 'defies logic,' allowing plenty of fresh air in -- even though it's 32 stories tall.

Gensler

Completed in 2015 and designed by Gensler, the building features a chimney-like system that invites air in through small panels in the facade, while maintaining insulation to keep energy costs low.

Gensler

The tower serves as Gensler's Pittsburgh headquarters.

Hoskins adds that the fresh air has proved beneficial for some employees, who have told her it helps them feel more alert and productive.

Gensler

'You can actually feel the difference in the building,' she said.

Gensler

Next, Hoskins named the Gratz Center, Gensler's expansion of the Fourth Presbyterian Church in Chicago, Illinois. The original church is next door, on the right.

Gensler

She also joked that she kept referencing Gensler works as her favourite buildings. 'That's why I work here,' she said.

She said that the community center pays tribute to the history of the site -- the church opened in 1912 and is important to the city's residents -- but also has a modern design.

Gensler

Hoskins said the center's labyrinth is her favourite feature in the building.

Gensler

'It's an incredible space for people,' she said.

Gensler

Frank Lloyd Wright's Robie House, located in Hoskins' hometown of Chicago, inspired her to become an architect.

James Caulfield/Frank Lloyd Wright Trust

'I was one of those kids who played with Legos, which is typical of architects. We love building things from babyhood,' she said.

At seven years old, she remembers seeing the Robie House for the first time, and being struck by its windows with abstract patterns of coloured and clear glass.

James Caulfield/Frank Lloyd Wright Trust

Built between 1909 and 1910, the Robie House is a US National Historic Landmark, located on the University of Chicago campus in Chicago's South Side neighbourhood.

Frederick C. Robie, a 28-year-old assistant manager of a manufacturing company at the time, commissioned famed architect Frank Lloyd Wright to design it as his residence.

Inside, the living and dining rooms flow into one another and open through a series of French doors. An exterior balcony runs the length of the south side of the home, which overlooks an enclosed garden.

James Caulfield/Frank Lloyd Wright Trust

'Its windows and doors look different than any other windows and doors you've ever seen before,' Hoskins said. 'Everything was design.'

James Caulfield/Frank Lloyd Wright Trust

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