Eastdil Secured is a real estate investment bank that acts as a brokerage for large deals involving Class-A office buildings in central business districts or portfolios of buildings. The firm is a roll-up of various acquisitions, based on Eastman Dillon Union Securities, founded by Ben Lambert in 1967. In turn, the firm became a target when NYSE-listed Wells Fargo acquired it (then called, Eastdil Realty) in 1999. In 2005, Wells Fargo also acquired Los Angeles-based real estate investment banking firm Secured Capital Corp. and merged it with Eastdil to create Eastdil Secured.

The firm got the assignment that made its reputation in New York City in 1997: to sell the $5 billion commercial and residential portfolio of Leona Helmsley, amassed by her husband, Harry. The 125 buildings, including 230 Park Avenue, the Starrett-Lehigh Building at 601 West 26th Street and the Graybar Building at 420 Lexington Avenue, took several years to unload. Since the merger of Eastdil and Secured under the Wells Fargo umbrella, the combined firm brokered over $1.2 trillion in completed transactions, according to its website.

In 2019, Lambert and CEO Roy March orchestrated a management-led buyout in a venture with Guggenheim Investments and Singapore sovereign-wealth fund Temasek Holdings.