M id A tlantic Real Estate Journal — Owners, Developers & Managers — July 2026 — 41
www.marej.com
O wners , D evelopers & M anagers
Project uses almost 1,600 Crystal combination windows Largest Philadelphia office-to-residential conversion chooses Crystal Window & Door Systems
HILADELPHIA, PA — The newly opened 17 Market West project in downtown Philadelphia is another shining example of the exemplary product line of Crystal Window & Door Sys- tems . This 17-story office-to- residential conversion project, the largest such post-pandemic project in Philadelphia, utilized 1,560 large energy efficient Crystal architectural-rated windows. The combination of casement and fixed windows maintained the building’s mid- century historic appearance while providing residents with comfort, great energy perfor- mance, easy operation, and unparalleled city views. The Crystal windows for 17 Market West used a repetitive symmetrical pattern throughout the building. Each façade fea - tures four combination windows in a horizontal bay spanning a 21 ft. wide by 7.5 ft. tall opening be- tween vertical columns. East and west facades have 11 bays per floor, and the north and south facades have 4 bays per floor. The two window models used for the project were the Crystal Series 8520 Project-Out Awning and the Series 8510 Fixed/ Picture. The 8520 and 8510 sashes were all arranged in 7.5 ft. tall vertical combinations using common master frames and impost mullions. Combina - tions consisted of either fixed- over-fixed or awning-over-fixed stacks. All the top windows were specified with two hori - zontal exterior applied grids. When viewed, the grids and the horizontal mullions between top and bottom sashes divide each tall combination window into 4 equal portions for a particularly appealing appearance across all bays, floors, and facades. The Crystal Series 8520 heavy commercial project-out awning model has a 2-⅝” jamb depth and an architectural rating of AW-PG80. For ease of operation and weather resistance, the windows feature 4-bar HS/SS friction hinges and double-bulb weatherstripping. While most of the project’s Series 8520 window sashes used the standard cam handle operator, those windows installed in ADA compliant apartments were ordered with the optional rotary operator handle as well as 8” extended handle locks. For resident safety, all operating units were outfitted with 4” sash opening limit stops. The Crystal Series 8510 fixed/picture window is also P
a 2-⅝” jamb depth heavy commercial architectural aluminum window with an AW-PG85 rating, comple - menting the Series 8520 and all the styles of the Series 8500 product line. All the Crystal window pan - els used 1” insulated glass units (IGUs) which were fitted using a special glazing bead into the optional 1-¼” glazing pocket window frames. The larger glazing pockets and special glazing were needed to accommodate the applied exterior ⅞” wide horizontal window grids. The IGUs were
specified with Vitro Solarban 70 low-E coated glass for vi - sion panels. For a handful of spandrel units, OpaciCoat 300 medium gray 3-0586 coated glass was used in the IGUs. All of the window frames, sills, and visible sustainable accessories were finished in an AAMA 2604 custom Mystic Bronze powder coat paint. A variety of Crystal’s fabri - cated accessories were used to facilitate installation of the combination windows. Three- piece mullions were used to arrange groups of combination units horizontally. Subsills,
receptors, and strap anchor accessories simplified and speeded window installations in building openings. Clip and snap trim tastefully finished off window interiors. Teaming up with Crystal on the project were develop- ment firm Alterra Property Group of Philadelphia, PA, and architecture/engineering firm NORR of Chicago, IL, and Philadelphia. The general contractor was Clemens Con- struction Company of Phila - delphia, and the fenestration installer was GMI Contrac- tors of Bristol, PA. MAREJ
17 Market West
DOLLARS & SENSE
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William A. Hutchinson Jr. LMP, Plumbing Lic. #5041. Anthony V. Schiavone, Master HVACR HIC#19HC00055300 HVAC H ENERGY EFFICIENCY H MECHANICAL SERVICES H PLUMBING 888-777-4501 • HUTCHBIZ.com
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