| 1835 Market Street | |
| Status: | Completed |
| Location: | 1835 Market Street, Philadelphia, Pennsylvania, United States |
| Architect: | Kling Lindquist Partnership |
| Map Type: | Philadelphia#Pennsylvania#USA |
| Owner: | Nightingale Properties[1] |
| Floor Area: | 686503square feet |
| Floor Count: | 29 |
| Parking: | 176 spaces (underground) |
| Building Type: | Office |
| Roof: | 425feet |
| Main Contractor: | Turner Construction Company |
| Opening: | 1986 |
| Developer: | Radnor Corporation |
1835 Market Street, formerly known as Eleven Penn Center (or 11 Penn Center), is a high-rise building located in the Market West region of Philadelphia. The building stands at 425abbr=offNaNabbr=off with 29 floors. Radnor Corp. the real estate arm of Sun Co. began development of the property in 1984.[2] It opened in 1986 and Colonial Penn was one of the anchor tenants. The architectural firm who designed the building was the Kling Lindquist Partnership.[2] 1835 Market Street is a part of Penn Center complex, which includes several notable skyscrapers such as the Mellon Bank Center and Five Penn Center.
It is currently the 24th-tallest building in Philadelphia.
In 2002, a joint venture including the California State Teachers' Retirement System (CalSTRS) purchased the tower for .[3] CalSTRS sold it to Nightingale Group for in 2014.[4]