Starr Insurance is set to significantly expand its presence in Center City Philadelphia, leasing the entire 31,600-square-foot top floor of 30 S. 17th Street, also known as Duane Morris Plaza. The move represents a 66% increase in space for the New York-based insurance and investment firm, which currently occupies about 19,000 square feet at 1601 Market Street, less than a block away.

According to Savills’ quarterly market report, the lease marks one of the first major deals at the 20-story tower since Oaktree Capital Management, the building’s Los Angeles-based owner, announced plans for lobby renovations and system upgrades. The improvements coincide with Duane Morris LLP’s long-term lease renewal, which included a 45,000-square-foot downsize. The law firm will retain 195,000 square feet and continue as the building’s anchor tenant with naming rights.

Starr Insurance, which reported $11.9 billion in gross written premiums and $41.1 billion in total assets as of December 31, plans to relocate to its new space in the summer of 2026.

“We’re looking forward to moving to accommodate our growing local employee base and provide them with a top-level office environment close to our key distribution partners,” said Hunter Hoffman, Starr’s Chief Marketing Officer.

The transaction highlights renewed leasing momentum in Center City, as companies seek high-quality, amenity-rich office environments that support collaboration and long-term growth.