In 1984, at age 27, Mark moved to Aspen to open Mark Justin, which became a successful retail-clothing store/guide and outfitting service for over 10 years. In 1995, he had the opportunity to acquire the building that housed his operations and subsequently commenced what has become a 22-year real estate career totaling over $725 million in residential sales. Mark has also been involved in Aspen's commercial real estate market by developing/restoring the Wheeler Block, the A.G. Sheppard and Prada buildings in Aspen and have been honored by Aspen's Historic Commission for his work.
In the past 6 years, Mark has represented the sellers of the highest priced single-family home sales in the state of Colorado on two separate occasions. The closing of Aspen's Summit House for $29.5 million was the most expensive home sale in Colorado in 2015, and he brokered both the listing and selling sides of a $20,750,000 Aspen estate which was the highest priced home sale in the state of Colorado in 2011. Between those sales, Mark represented the Buyer in the first successful real estate auction in Aspen, which sold for $11,750,000 in 2012, and most recently, he concluded the sale of an Aspen penthouse for $13,200,000, which, at $2,700/sq ft, was one of the highest prices per square foot ever paid in Aspen's real estate history. Because of these accomplishments, Mark has earned the respect of his peers as well as his customers and clients.
Mark and his wife, Laura, spend time in South Florida during the "off seasons", and their son, James, is a Sous Chef at John Besh's and Aaron Sanchez's collaborative restaurant, "Johnnie Sanchez" in New Orleans, LA.