Crystal Cox/Insider
Ryan Serhant, who's sold $10 billion in real estate over 16 years, swears by his '1,000-minute rule'
Courtesy of Andrea Mac
Courtesy of Nolan Church; Isabel Fernandez-Pujol/ BI
Crystal Cox/Insider
Courtesy of Andrea Mac
Courtesy of Nolan Church; Isabel Fernandez-Pujol/ BI