By Paul Schwedelson – Reporter, Philadelphia Business Journal
Construction and engineering firm Day & Zimmermann will slash its office space by half when it moves to 1835 Market St. next year.
The firm signed a long-term, 48,074-square-foot lease and will relocate from more than 100,000 square feet at 1500 Spring Garden St., where it’s been headquartered for nearly two decades, according to brokerage firm Savills’ quarterly market report and industry sources.
Day & Zimmermann generated $3 billion in revenue in 2024, up from $2.3 billion the year earlier, to rank sixth in the Business Journal’s List of the largest private companies in the Philadelphia area. The firm had more than 1,600 employees in the region and 37,000 employees total, according to Business Journal data.
Day & Zimmerman didn’t respond to requests for comment. The third-generation family owned company was founded in 1901 and specializes in construction, engineering, staffing and defense for global corporations and governments.
Despite the significant downsize, the lease is one of the larger Center City office leases this year.
Both 1500 Spring Garden St. and 1835 Market St. are owned by entities that were partnerships of New York firms InterVest Capital Partners and Nightingale Properties. Nightingale Properties has recently dealt with financial troubles and earlier this year CEO Elie Schwartz was sentenced to seven years in prison for an investment fraud scheme.
The 2024 assessed value of the 13-story, 1.2 million-square-foot 1500 Spring Garden St. building was reduced to $87 million from $192.6 million last year. For tax year 2025, it was reduced to $76 million from $159.2 million.
At 1835 Market, Klehr Harrison Harvey Branzburg signed a short-term extension to retain its 67,000 square feet this past spring. Other tenants in the building include the U.S. Department of Labor, which takes 80,000 square feet, and law firms Burns White and the Gold Law Firm. 1835 Market is also known as Eleven Penn Center.
Full story: https://www.bizjournals.com/philadelphia/news/2025/10/05/day-zimmermann-relocation-philadelphia.html
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