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17 February 2016

HOK Philadelphia Office Achieves LEED-CI Silver Certification


The sustainable design strategies for HOK’s new Philadelphia office create a healthy, productive workplace for employees while saving money through reduced energy costs. 

HOK’s Philadelphia office, which opened in 2015, recently achieved LEED for Commercial Interiors Silver certification from the U.S. Green Building Council.

“HOK is proud to be part of the Philadelphia community and committed to building a sustainable practice,” says Stephen Beacham director of design, interiors for HOK’s Philadelphia office. “For the design of our own workplace, we wanted to practice what we preach about sustainability simply being part of good design and not requiring extra costs.”


This new office is located on the 15th floor of the One Logan Square building in Philadelphia’s Central Business District. The neighborhood includes the Barnes Foundation building, the Academy of Natural Sciences, the Franklin Institute, the Logan Hotel, the Cathedral Basilica of Saints Peter and Paul, and the new Comcast Innovation and Technology Center. In addition to these community connections, HOK’s office is less than half a mile away from Penn Center’s Suburban Station, which has an underground commuter rail station.

The One Logan Square building has an angled facade and narrows at the eastern end. The design team took advantage of this floor plate by installing expansive six-foot windows and locating conference rooms and open-office seats along the outer edge. Full-height glass office and conference room partitions help ensure that 96 percent of the regularly occupied space has views to the exterior. Eighty-two percent of the space meets LEED’s minimum foot-candle requirements for natural light.

Philly Daylight2

All of the regularly occupied spaces have daylight harvesting controls and occupancy sensors. Ninety-five percent of the occupied workspaces and all of the shared, multi-occupant spaces have lighting controls. This reduces lighting power density (LPD) by 31 percent compared to code requirements. HOK purchased renewable energy certificates (RECs) for 100 percent of the office’s annual electricity use for two years.

PhillyMosaicA 150-sq.-ft. mosaic created by local artist Isaiah Zagar in the office’s reception area features recycled tile and ceramics. Twenty-four percent of the office’s finishes are made from regional materials and 16 percent of the total building materials are made from recycled materials. During construction, 96 percent of the construction waste was diverted from landfills. The project team specified low-emitting materials and implemented a construction indoor air quality management plan.

HOK’s team worked with Brandywine Realty to develop an enhanced green cleaning policy that uses low-emitting cleaning chemicals, sustainably sourced janitorial paper and soaps, decibel-rated power equipment, advanced training for janitorial staff and quality assurance inspections. A public education program includes signage and tours describing the sustainable design strategies.