- For Lease Contact for pricing
- Property Type Office
- Property Size 857,308 SF
- # of Floors 20
- Parking Ratio 0.20 / 1,000 SF
- Building Class A
- Year Built 1930
- Date Updated May 15, 2026
Description
The One Washington Square (formerly Penn Mutual Towers) are established landmarks centered within Philadelphia's historic and business districts. The award-winning three-building complex, with towers constructed in 1914, 1930 and 1972, is one of the city's most highly regarded corporate addresses hosting a roster of prestigious firms. The Penn Mutual Towers overlook Independence Square and offer extraordinary views of the city from nearly every floor. The Philadelphia waterfront and some of the nation's most significant monuments add to the appeal of this important location. Impressive polished marble floors, commanding columns and intricate plaster ceilings above the walnut concierge and security station are striking indications of the quality of the complex. First class renovations throughout both towers offer comfortable, attractive and flexible space. Expansive window lines further enhance the setting, allowing natural light in offices and spectacular views.
Highlights
- allowing natural light in offices and spectacular views.Close proximity to the Federal Court
- and galleries adds to the convenience of this fine office complex. The Penn Mutual towers are also within walking distance from a number of residential areas including Society Hill and Queen Village.Onsite banking servicesNumerous hotels
- attractive and flexible space. Expansive window lines further enhance the setting
- City Hall
- commanding columns and intricate plaster ceilings above the walnut concierge and security station are striking indications of the quality of the complex. First class renovations throughout both towers offer comfortable
- fine restaurants
- Impressive polished marble floors
- medical centers
- Philadelphias Central Business District as well as hotels
- shops
- shops and dining areas within a threeblock radiusSurrounding parks and historic monuments are easily accessible by carFour garages within a three block radius
- theaters
True
13 Spaces Available
Partial 10 Floor
Space Type
Office
Lease Rate
Negotiable
Total Space
44,549 SF
Floor
10
Divisible Space
44,549 - 44,549 SF
Available Date
Jun 1, 2026
Lease Type
Modified Gross
Renewal Option
Yes
Sublease
No
Build Type
Full build out
Partial 12 Floor
Space Type
Office
Lease Rate
Negotiable
Total Space
15,977 SF
Floor
12
Divisible Space
15,977 - 15,977 SF
Available Date
Immediate
Lease Type
Modified Gross
Renewal Option
Yes
Sublease
No
Build Type
Full build out
Partial 13 Floor
Space Type
Office
Lease Rate
Negotiable
Total Space
8,550 SF
Floor
13
Divisible Space
500 - 8,550 SF
Available Date
Immediate
Lease Type
Modified Gross
Sublease
Yes
Sublease Expiry
Nov 30, 2029
Build Type
Full build out
Partial 15 Floor
Space Type
Office
Lease Rate
Negotiable
Total Space
7,832 SF
Floor
15
Divisible Space
7,832 - 7,832 SF
Available Date
Immediate
Lease Type
Modified Gross
Renewal Option
Yes
Sublease
No
Build Type
Full build out
Partial 16 Floor
Space Type
Office
Lease Rate
Negotiable
Total Space
2,561 SF
Floor
16
Divisible Space
2,561 - 2,561 SF
Available Date
Immediate
Lease Type
Modified Gross
Renewal Option
Yes
Sublease
No
Build Type
Full build out
Contacts
Jack Meyers
Cushman & Wakefield
Daniel Brogan
Cushman & Wakefield
Brian Young
Cushman & Wakefield
Jason Bernardi
Cushman & Wakefield
Location
Located at 510-530 Walnut Street, Philadelphia, PA 19106, this property is part of the Society Hill neighborhood and Philadelphia market.
Contact The Washington
