Four Seasons Hotel Philadelphia at Comcast Center

Philadelphia, The United States

Property owner

Liberty Property

Main contractor

LF Driscoll


Foster + Partners, Rottet Studio

Acoustic consultant

Metropolitan Acoustics

Structural engineer

Thornton Tomasetti Inc.


Floating floor for the ballroom over the lobby of Comcast Tower

Building type

Residential & Hotel

Intervention level



The newly completed Comcast Technology Center stands as one of the tallest building in the United States and is the tallest building outside of Manhattan or Chicago.

Four Seasons guestrooms occupy floors 48 to 60, perched high above center Philadelphia. The ballroom located on the fifth floor is directly above the impressive Comcast office lobby, housing Steven Spielberg’s immersive VR Universal Sphere.

Constrained by a previously defined floor-ceiling height for the ballroom, very little space was left for the acoustical consultant, Metropolitan Acoustics, to isolate the lobby below from the ballroom.

With a build-up less than 3-1/2” thick, CDM-QuietDECK, an ultra-low-profile floor isolation system was able to meet the required acoustical performance and height constraints. This lightweight and low-profile floating floor system offers durability and functions for a wide range of live loads – a perfect solution for this multi use reconfigurable space. Today, the Four Seasons Ballroom, is one of the key elements of the hotel and building complex.

Key Benefit of CDM’s Solution:

  • CDM provided this system as a complete “turnkey” solution, manufacturing, delivering, and acting as the installing subcontractor. Assuring the construction team, design team, and owner of the isolation performance.
  • CDM offers installation services in select States, giving you both peace and quiet, and peace of mind.


© Christian Horan Photography / Four Seasons

Four Seasons Hotel Philadelphia at Comcast Center – CDM-QuietDECK
Four Seasons Hotel Philadelphia at Comcast Center – CDM-QuietDECK
Four Seasons Hotel Philadelphia at Comcast Center – CDM-QuietDECK

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