PHILADELPHIA — Newmark Knight Frank (NKF) has arranged the sale of a two-building property located at 421 N. Seventh St. in Philadelphia. Arts & Crafts Holdings acquired the property from Callowhill Center Associates for $20.1 million. Situated on 2.4 acres, the property features 188,167 square feet and is the long-term home of The Electric Factory, an iconic 50-year-old concert promotion company. At the time of sale, the property was 38.2 percent occupied with small tenants and The Electric Factory. Mike Margolis, Dave Dolan, Dave Garonzik, Jeff Tertel and Jim Egan of NKF represented the seller in the transaction.