http://www.phillymag.com/property/20...15th-chestnut/
Philly Chit Chat’s HughE Dillon explains:
This week they are beginning to test the soil in anticipation for the building as well as the extensive underground parking lot they’re building. Last week officials from the project went around to the surrounding buildings, including the new Alterra project (right across 15th Street, Alterra Property Group and the Scully Company’s conversion of 150,000 square feet of class B office space into 180 apartments, with a small amount of office and retail space), and took photos of them inside an out – “The Before Photos”, just in case vibrations from the drilling and building the W causes any cracks in the neighboring buildings.