Meet the Team
William Fastow
One of the DC area’s foremost boutique brokers, William Fastow is the founder of the Appleton Properties Group which merged with TTR Sotheby’s International Realty in 2018. William is known for his drive, his passion for real estate and an uncompromising commitment to customer service. He has represented buyers, sellers and developers across some of the East Coast’s hottest real estate markets including Boston Massachusetts and Washington DC since 2001.
William holds an M.A. in Marketing Communications from Emerson College, with specializations in Crisis Communication, Advertising and Integrated Marketing/Business Communications. He has a B.A. from James Madison University in English Literature and studied Architecture through the University College of London. In 2003 William founded the boutique brokerage Appleton Properties which focused on the representation of buyers, sellers and developers interested in the acquisition and sale of architecturally relevant and historic properties in the urban markets of Boston Massachusetts and Washington DC.
A native Washingtonian and current resident of the Spring Valley neighborhood, William’s knowledge of the region stems from his personal as well as his professional experiences. Being from Washington is a special distinction and makes William more than familiar with the history of the different communities and neighborhoods that make up DC and the surrounding metropolitan area. He has worked with buyers, sellers, investors and developers across the city of Washington as well as Montgomery County, Annapolis Maryland and as far as the Eastern Shore. William also maintains contacts and business interests in Boston Massachusetts which makes him an ideal resource for clients relocating in and out of the New England area.
When not representing TTR Sotheby’s International Realty, working with clients, or serving as a consultant for real estate development projects, William can be found sailing aboard his 40 foot Robert Perry designed sloop “Artax” out of Annapolis Maryland. William is an accomplished lifelong competitive sailor and yachtsman who has logged thousands of coastal and ocean miles aboard numerous racing and cruising yachts including multiple entries into the prestigious Annapolis to Bermuda race, New York Yacht Club Race Week and multiple one design national events. Additionally, William stays involved in his community volunteering his time and expertise as a board member and facilities chair for Byte Back, a nonprofit organization that provides free technology training to low-income DC residents, as well as being active with the Jewish Federation of Greater Washington where he co-chairs their interfaith council which is tasked with creating warm and inviting community outreach opportunities for interfaith families in the greater Washington DC area.
Nominated as the Best Realtor in Washington by Triple.com
Contact William Fastow
202.536.7675
Wfastow@ttrsir.com
Valerie Schaffner
Born and raised in Anne Arundel County, Maryland, Valerie is deeply rooted in the local community and brings a wealth of knowledge to every client experience. With a degree in Business Administration from Towson University, she began her career in real estate and property management in 2012 as an assistant where she quickly discovered a true passion for the industry.
Valerie earned her Maryland real estate license in 2014, and has since expanded her licensure to include Virginia and the District of Columbia. Today, she serves as Contract Manager for the William Fastow Team, ensuring each transaction moves smoothly from contract to closing. In this role, Valerie prides herself on being extremely detail-oriented and providing clients with an added sense of security, clarity, and protection throughout the process.
Designations/Awards: DSAC Member, RE/MAX 100% Club, RE/MAX Platinum Club, Baltimore Real Producer, Chesapeake Real Producer.
Contact Valerie Schaffner
Tracy Renken
As a Michigan native, Tracy’s down-to-earth personality has allowed her to make many connections with clients and professionals in the real estate industry. After degrees from Central Michigan University and Michigan State University, she moved to the DC area over 20 years ago and fell in love with the unique neighborhoods that DC has to offer. She has personally lived in Maryland, DC and now resides in Virginia.
Tracy’s number one goal is providing the best client service and consultation before, during and after the transaction process. She is a hard-working, trustworthy, and respected agent in the DC area who is available at any time should questions or concerns arise. In addition, she is licensed in DC, MD and VA. When not working with her clients, Tracy enjoys sports/fitness, live music events and many outdoor activities.
Contact Tracy Renken
Clare Mulderig
A Potomac, Maryland native, Clare is excited to return to the Washington, D.C. area and contribute to the community she has long admired. She earned her Bachelor of Science in Mass Communication with a concentration in Advertising from Towson University and brings a strong background in client relations and collaborative client support.
Clare combines experience in client partnership development with a commitment to high-quality service, approaching her work with a motivated, positive attitude and a dependable work ethic. While supporting interior design teams, she gained valuable insight into residential home design and the importance of client-focused projects.
In her role as Director of Operations, Clare looks forward to deepening her knowledge of the real estate industry while playing a key role in the strategic and day-to-day operations of the William Fastow Team. She is committed to supporting the team’s continued growth and success by streamlining processes, enhancing client experiences, and fostering strong internal collaboration. Clare takes pride in fostering an environment where clients and colleagues feel supported, informed, and valued.
Outside of work, Clare enjoys staying active through yoga and barre, trying out new recipes, and exploring D.C.’s restaurants and coffee shops, taking in all the charm the city has to offer.