Cushman & Wakefield on Thursday staged a daring raid of rival Eastdil Secured, hiring away Douglas Harmon, the world’s No. 1 investment real estate sales broker.

Harmon, who has been with Eastdil for 20-plus years, led his former employer in 2015 to an industry-dominating $22.7 billion in revenue across 56 sales, a per-deal average of $405 million — three times more than its closest rival, a Real Deal report found.

By contrast, No. 3-ranked Cushman raked in $3.4 billion over 242 transactions, for an average deal size of $14 million.

Harmon’s 2015 stats do not include sales of minority stakes, which are now a greater percentage of the sales market as owners retain management and leasing and sell non-operating positions for pricing that can exceed $1 billion.

Harmon completed roughly $50 billion in deals in 2014 and 2015 combined, with nearly 20 of those worth more than $1 billion. These include: the sale of Stuyvesant Town and Peter Cooper Village for $5.45 billion, the Crown Building for $1.775 billion, and the Waldorf Astoria for $1.95 billion.

A Brown graduate with an MBA from the Anderson School of Management at UCLA, Harmon made a splash in 1998 as he handled the sale of the Helmsley Portfolio for Leona Helmsley — then valued at more than $5 billion.

He also sold Harry Macklowe the GM Building for the then-highest city price of $1.4 billion and later sold Macklowe partner Jamestown’s stake, recapitalizing the building at $2.4 billion.

In 2010, Harmon sold Google its Chelsea headquarters for $1.9 billion, creating an instant center of gravity and growth for the city’s tech tenants.

Joining Harmon in jumping to C&W are his colleagues Adam Spies and Kevin Donner. Harmon and Spies join as chairmen, capital markets. Donner will serve as executive managing director.

Cushman & Wakefield is led by the California-based Brett White, the former chief executive of CBRE.

White left CBRE in 2012 to join DTZ, which last year merged with C&W.

“As the recognized leaders in the New York institutional capital markets business, we are pleased to welcome Doug, Adam and Kevin to Cushman & Wakefield,” White said in a statement.

“Together they have more than 50 years of high-profile real estate experience including more than 500 major transactions covering all major asset types with a combined transaction value of more than $200 billion dollars,” White said.