In his 10 years in business, Eklund has closed on more than $3.5 billion in real estate.
He was also named the No.1 real estate agent in New York City by The Real Deal in 2014.
"For any deal to happen - especially a business transaction - the two sides need to get in a balance," Eklund advises in his book, "The Sell: The Secrets of Selling Anything to Anyone."
"My firsthand experience negotiating billions of dollars in deals has taught me what works and what doesn't," he writes.
Here are 10 tips Eklund outlines in "The Sell" on how to negotiate and seal any deal: