The company's big year took place in a luxury market that retrenched worldwide, but was particularly acute in some places, including New York. The ultra-exclusive enclave of the Hamptons saw sales tumble 8 percent in 2016, according to Town and Country Real Estate, while luxury units sales in Manhattan plummeted by 18 percent last year, according to data from real estate broker Donna Olshan.
This week, Knight Frank released data showing the luxury property market slowed worldwide last year, with slower price appreciation in places like the London and New York— traditionally two of the most expensive markets on the planet. Overall, luxury home values rose by a slim 1.4 percent in 2016, Knight Frank's report said.
Against that backdrop, Sotheby's International Realty recorded $85 billion in domestic sales volume, while increasing its sales force and offices. However, White said the firm's recipe for success included elements that are unconventional, and perhaps a bit counterintuitive when servicing demanding high-end clients.
"There are not a lot of people who can buy some of these places, and we have to work hard to get in front of the right people," said White, a former Marine. However, "sometimes we have to tell them things they don't want to hear."
Needless to say, the ultra-rich aren't usually considered the sort of people who take "no" for an answer, and often expect a certain result. However, White explained that honesty and transparency are key ingredients to moving luxury homes — especially in a challenging market.
"That's when you have to do your homework and be prepared," White said, adding that Sotheby's International Realty agents perform extensive research on a particular market to assess a home's true value.
"If you go into someone's house and say 'it's worth this [much]' and the seller might be disappointed, you can tell them you looked at" other houses in the area, White said. Then, the firm explains "how their house compares to all the others, because you took the time to go through all the others. That's doing your job."
He added: "It's easier to go along with them, but that's not doing them a service because it's not going to sell. It's doing them a disservice."
Meanwhile, wealthy international buyers continue to flockto U.S. real estate, helping to keep the market comparatively buoyant despite pockets of softness. That global effect means real estate — a notoriously local market — now has a much more international flavor. It has also transformed the way real estate firms service their clients, according to Sotheby's International Realty's White.
"These are substantial properties and there are times when [clients] want us to do more than stick a sign in the yard, list them...and hope for the best," White said.
"They want a targeted, discreet marketing program There are not a lot of people who can buy some of these places, and we have to work hard to get in front of the right people."
This story was updated to include new data on the luxury real estate market's performance in 2016