Monday, August 4, 2025
Halcyon, the nonprofit accelerator that has supported nearly 600 impact-driven entrepreneurs globally, announced July 29 that it will exit its historic Georgetown headquarters, Halcyon House, at 3400 Prospect St. NW, early next year.
“From the very beginning, my dream was to create a sanctuary where changemakers could come together, innovate, and create lasting impact,” said Dr. Sachiko Kuno, co-founder of Halcyon. “I’m incredibly proud of what our community has accomplished and look forward to supporting Halcyon’s next phase in a new space that reflects our shared mission.”
Halcyon’s President and CEO, Daniel Barker, added that “Plans are already underway to identify a new, centrally located headquarters in Washington, D.C., that reflects Halcyon’s scalable, global mission and the inclusive spirit championed by Dr. Kuno. The new space will not only house Halcyon’s staff and programs, but also serve as a vibrant hub to connect and convene Halcyon’s broader ecosystem of social impact entrepreneurs, partners, and changemakers.”
Halcyon describes itself as “a Washington, DC–based nonprofit accelerator empowering early-stage social-impact ventures. Since its founding in 2014, Halcyon has nurtured entrepreneurs addressing global challenges through fellowships, workspace, mentorship, and a vibrant international network.”
Kuno with her then husband Ryuji Ueno took possession of 30,000-square-feet Halcyon House from the Dreyfuss family on March 1, 2012, at the price of $11 million. The historic property has seen many owners — from first Secretary of the Navy Benjamin Stoddert, who built it in 1787, and eccentric Albert Clemens, supposedly Mark Twain’s nephew, who enlarged it, to architect John Dreyfuss, who restored and renovated it during the 1990s.
In 2011, Kuno and her then husband bought the Evermay estate at 1623 28th St. NW, also in Georgetown, and made it the headquarters of the S&R Foundation, which supports artists, scholars and community organizations. Today, S&R Evermay also owns the former Fillmore School on 35th Street, which houses Georgetown Village.