If you're at the office, you're not out selling real estate! How to build your reputation, one client at a time. Mara Flash Blum is Senior Global Real Estate Advisor of Sotheby's International Realty in New York City. She’s been ranked among Sotheby’s International Realty’s top producers both in its downtown office and in the top 25 brokers nationally since rankings began in 2009. She also consistently ranks on the Wall Street Journal and America’s Best Real Trends for being among the top 250 agents nationally by closed sales volume. Mara is an accomplished broker with over 25 years of experience selling luxury real estate.