Keystone Property Acquires 880,000 SF Office Building in Philadelphia for $114M

PHILADELPHIA — Keystone Property Group has acquired One Washington Square, also known as the Penn Mutual Tower, located at 510-530 Walnut St. in Philadelphia. An undisclosed seller sold the 880,000-square-foot commercial building for $114 million. The building is occupied by several corporate headquarters, including the American Board of Internal Medicine, Urban Engineers and BPD International. Keystone plans to convert the building’s ground floor and mezzanine office space located at 530 Walnut St. into retail space.

Content Partners
‣ Bohler
‣ Lee & Associates
‣ Lument
‣ NAI Global
‣ Walker & Dunlop

Webinars on Demand


Subscribe to the newsletter

Read the Digital Editions

Midwest Multfiamily & Affordable Housing Business

Western Multfiamily & Affordable Housing Business

Texas Multfiamily & Affordable Housing Business

Southeast Multfiamily & Affordable Housing Business

Heartland Recent Issue

Northeast Recent Issue

Southeast Recent Issue

Texas Recent Issue

Western Recent Issue

Shopping Center Business

California Centers

Student Housing Business

Seniors Housing Business

Featured Properties  

2021 Finance Insight Video Interviews