601 Walnut Street
Philadelphia, PA 19106
The Curtis is a, 12-floor, 912,245-square foot building situated on Independence Mall in Philadelphia, Pennsylvania. Constructed between 1909 and 1921, The Curtis originally housed Curtis Publishing, owner of publications such as Saturday Evening Post and Ladies Home Journal. Keystone acquired the building in 2014 as part of a plan to activate the historic property and the surrounding area. In 2018, the building completed a dramatic transformation that turned it into a true mixed-use destination. Today, the building is home to thriving office space, retail, public events, and dining, as well as The Lyndon at the Curtis—a collection of 63 high-style apartments.
With flexible floor plan layouts, the building accommodates modern office suites ranging from 1,000 to 83,000 square feet. The Curtis boasts a diverse mix of strong office tenancy, including Jefferson Health, City of Philadelphia, GSA, Philadelphia Magazine, and most recently, IMVAX, a bio-tech company focused on developing vaccines and immunotherapy strategies for cancer. The Curtis’ infrastructure is uniquely supportive of lab space, thanks to its ventilation systems, high-capacity weight-bearing floors, and proximity to medical institutions. The addition of IMVAX adds another innovative, non-traditional use to The Curtis.
In 2017, Keystone introduced The Lyndon at The Curtis, 63 upscale residences with a host of amenities, including a fitness center with on-demand classes, dedicated yoga studio and spin area; private dining room with communal kitchen; clubroom and billiards table; golf simulator; and 24-hour concierge. The Lyndon outperformed expectations and Keystone is currently building an additional 23 apartments
In addition to high-style apartments and office space, The Curtis offers a first-class shopping, dining, and cultural experience. 40,000 square feet of retail space includes the Philadelphia home of famed NYC tavern P.J. Clarke’s; Constellation Culinary; on-site daycare Busy Bee Learning Center; Germantown Friends Early Education School; a full-service deli; and other offerings. The building also boasts a dramatic, 12-story atrium and “The Dream Garden”–one of the largest Tiffany mosaics in the world.
Altogether the result is a mixed-use destination unlike any other, ensuring The Curtis’ status as an enduring landmark of commerce and culture in Philadelphia.