Liberty Property Trust

One Liberty Place looking northeast. Photo by Thomas Koloski

Looking Back to the Moment When One Liberty Place Passed the Statue of William Penn Atop Philadelphia City Hall

7:30 am on January 10, 2022 By Thomas Koloski

For nearly 35 years, the Philadelphia skyline has been dominated by skyscrapers rising well above 500 feet in height. The idea to breach of the height limit informally established by the 548-foot-tall pinnacle of City Hall, also known as the “Gentlemen’s Agreement,” surfaced in 1984. The first tower to rise above the limit was One Liberty Place, a daring structure for the time that rises 945 feet and 61 stories above ground at 1650 Market Street in Center City. The project was designed by Helmut Jahn of Murphy/Jahn and developed by Rouse and Associates (which eventually became Liberty Property Trust), and was completed in 1987. In this feature, Philadelphia YIMBY takes a look back at when One Liberty Place passed the statue of William Penn on top of City Hall.

A Look at the Lobby of the Comcast Technology Center, Philadelphia’s Tallest Building

7:00 am on December 22, 2021 By Thomas Koloski

The Comcast Technology Center at 1800 Arch Street in Center City is both the tallest building and one of the largest structures in Philadelphia, standing 1,121 feet tall and spanning over 1.5 million square feet of interior space. Completed in 2017, the supertall stands 60 stories high and features office space on its lower floors and a hotel on its upper levels, with an observation deck at the top. The project was developed by Liberty Property Trust and designed by Foster and Partners, with Thornton Tomasetti behind the structural design and LF Driscoll as the contractor. Gensler crafted the exquisite and sometimes bizarre interior of the main lobby, with an architectural style well-suited for the modern workforce and the general public alike. In this feature, Philadelphia YIMBY observes the east lobby of the Comcast Technology Center which is open to the employees and the public at limited times.

Comcast Technology Center. Photo by Thomas Koloski

Revising Construction of the Comcast Technology Center Before it Topped Out

7:30 am on October 7, 2021 By Thomas Koloski

Since 1987, when the unofficial “Gentlemen’s Agreement” that advised against building taller than City Hall was eliminated, multiple high-rises that stand well over 500 feet tall have dramatically changed the profile of Center City. The Comcast Technology Center had first joined the skyline at the very end of 2015, and now makes an incredible impact with its height of 1,121 feet and 60 stories as the tallest skyscraper in the city. Designed by Foster and Partners and developed by Liberty Property Trust, the building stands at 1800 Arch Street and houses Comcast corporate offices along with a Four Seasons hotel. In this publication, Philadelphia YIMBY looks back at the Comcast Technology Center before it topped out.

Worker on top Two Liberty Place. Photo by Thomas Koloski

Observing the Construction of Two Liberty Place

8:00 am on September 19, 2021 By Thomas Koloski

Among the multiple structures that make up the Liberty Place complex, Two Liberty Place is the second tallest, rising 848 feet and 58 stories, yet it is the largest by area, with 1.2 million square feet. As such, the building is one of the most largest skyscrapers in Philadelphia, as the Comcast Center measures nearly 1.4 million square feet and the Comcast Technology Center holds 1.5 million square feet. Two Liberty Place is located near the heart of Center City at 50 South 16th Street. Just like the rest of Liberty Place, the tower was designed by Helmut Jahn of Murphy/Jahn, who had unfortunately passed away in a bicycle crash in Chicago in May. The project was developed by Willard Rouse of Rouse and Associates, which eventually became Liberty Property Trust.

Many more conceptual drawings of One Liberty Place. Drawings by Helmut Jahn

Looking Back at an Early Iteration of The Liberty Place Complex in Center City

7:30 am on September 18, 2021 By Thomas Koloski

From 1987 to 2007, the tallest building in the Philadelphia skyline was One Liberty Place at 1650 Market Street in Center City, rising 945 feet and 61 stories tall, closely followed by the adjacent Two Liberty Place at 50 South 16th Street, which stands 848 feet and 58 stories tall and was completed in 1990. Designed by Helmut Jahn and developed by Rouse and Associates (later known as Liberty Property Trust), the Liberty Place complex features a fantastic glass, metal, and stone design. Today, Philadelphia YIMBY looks back at an earlier iteration of the complex when the towers were still in designing stages in 1984.

Unfinished Liberty Place design model. Photo from Helmut Jahn

Visualizing the Under-500-Foot-Tall Early Iterations of Liberty Place on the Skyline

8:00 am on September 16, 2021 By Thomas Koloski

The Liberty Place complex is emblematic of the Philadelphia skyline as they played a key role in Center City‘s skyscraper growth. The towers currently stand 61 and 58 stories tall, with angled sharp crowns pointing toward to the sky, one tower capped with a tall and another with a short spire. The project was commissioned by Willard G. Rouse III of Rouse and Associates, who had originally pictured a $150 million 38-story tower rising to a height that measured somewhere under 500 feet. Just days after New Year’s Day in 1984, the building was first discussed in a publication about how Rouse won the bid for the site how it may become the city’s premier office tower. The architect, Helmut Jahn, was selected in March, and had produced a rapid succession of concepts under 500 feet, which eventually evolving well above that height. Today we share exclusive massing concepts of how the skyline would have looked if the towers were built to their originally planned height.

One Liberty Place Rainbow animated scheme from South Street. Photo by Thomas Koloski

My Liberty Lights Program Is Underway at One Liberty Place

7:30 am on August 30, 2021 By Thomas Koloski

Over the course of the past two years, the decorative illumination at the crown of One Liberty Place at 1650 Market Street in Center City has been under renovation, as it is being upgraded with powerful lights that can be animated into various schemes and colors. Designed by Helmut Jahn of Murphy/Jahn and developed by Rouse and Associates (later known as the Liberty Property Trust), the tower was completed in 1987 and stands 945 feet and 61 stories tall. The contractor for the illumination upgrade is The Lighting Practice, which has also decorated the W/Element Hotel. The new lighting system is integrated with the My Liberty Lights program, which allows certain users to change the exterior lights atop the building once per day for a duration of five minutes.

A Look at Early Iterations of Liberty Place When It Was Planned to Rise Under 500 Feet in Height

7:30 am on August 23, 2021 By Thomas Koloski

The Liberty Place complex in Center City is known for being the first building in Philadelphia to dramatically break the unofficial 548-foot height limit that was set by the statue of William Penn on top of City Hall. Upon completion, One and Two Liberty Place were the tallest skyscrapers on the skyline, standing at a height of 945 and 848 feet, respectively. The towers were designed by Helmut Jahn and developed by Rouse and Associates, which eventually became Liberty Property Trust. In this feature, Philadelphia YIMBY takes a look back at a number of early iterations of the complex when the towers were planned to stand around or under 500 feet in height.

Center City towers from North Broad Street. Photo by Thomas Koloski

One Liberty Place Lighting Nearly Complete with Upcoming Event in Center City

8:00 am on August 11, 2021 By Thomas Koloski

Over the course of the past few months, an upgrade of the decorative lighting system has been in progress at One Liberty Place at 1650 Market Street in Center City, where the light strips that highlight the angled top of the tower are being reworked. Designed by Helmut Jahn of Murphy/Jahn and developed by Rouse and Associates, the two massive skyscrapers of Liberty Place were the first in the Philadelphia skyline to boldly break past the informal 548-foot height limit established by the tower of City Hall nearly a century earlier.

Comcast Technology Center 2014 and current design from Spring Garden Street Bridge. Left: image by Foster and Partners. Right: Photo by Thomas Koloski

Comparing The 2014 and Final Design of The Comcast Technology Center

7:30 am on August 10, 2021 By Thomas Koloski

Soon after the completion of the 973-foot-tall Comcast Center in 2008, which stood as the tallest building in Philadelphia, local residents and outside watchers wondered what was next for the city skyline. Almost six years later, on January 15, 2014, the design for the Comcast Technology Center, then known as the Comcast Innovation and Technology Center, was revealed to the public. The tower would become the new tallest skyscraper in Philadelphia, planned to stand 1,121 feet tall at 1800 Arch Street in Center City, across the street from the previous record-holder. The design by Foster and Partners was an unfinished version of the current building, as many portions of the building had to be finalized. The developer of the Comcast Technology Center is Liberty Property Trust, which met its fate when it was purchased by Prologis Inc. In this YIMBY feature, we compare the 2014 design and the current version of the skyscraper using renderings, architectural models, and photographs.

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