We are sad to announce the passing of Mark Evan Teitelbaum on May 4, 2024, following a lengthy illness. He was 68. Born in New York City, and raised in Queens and Monsey, NY, he was the oldest child of Blanche (Goldenberg) and Arthur Teitelbaum. Known for his quick wit and for driving a hard bargain, he was a fixture of the Washington, DC, commercial real estate industry for more than 40 years. A tenant rep broker at CBRE, he was a mentor to many rising associates. Numerous clients became dear friends over the years and that extended to their families. Mark also made an effort to befriend the lobby attendants and parking attendants in every building he worked in. He loved to share information and almost everyone who knew him can attest to being given a book or two to read as homework. In addition, he was an active angel investor and was at his happiest when he was chasing a deal. Predeceased by his parents, Mark is survived by his children Drew (Jillian), Caroline, Jill, and Jonathan, and a grandson, Cal. He is also survived by his sisters Sue Teitelbaum and Joan (Dan) Kahn, and many nieces, nephews, and cousins. A proud alum of the University at Buffalo, he adopted the city as his hometown. His many passions included being an avid reader and a lifelong student of World War II, aviation, and all things business. Thanks to the many friends and family members who provided a steady source of encouragement and support since he was diagnosed, and special thanks to the capable professionals who formed his care team. Funeral service on Wednesday, May 8, 1 p.m. Judean Memorial Gardens, Olney, MD. Arrangements handled by Sagel Bloomfield Danzansky Goldberg Funeral Care Inc.