Global engineering and technology solutions leader relocating HQ to Metro Plaza District

Comstock Holding Companies, Inc. (NASDAQ:CHCI) ("Comstock"), a leading asset manager, developer, and operator of mixed-use and transit-oriented properties in the Washington, D.C. region, today announced the signing of a new 45,000 square feet lease agreement at 1900 Reston Metro Plaza in Reston Station with Amentum Services, Inc. ("Amentum").

Amentum is a worldwide provider of advanced engineering and technology solutions that address significant and complex challenges in science, security, and sustainability. With approximately 50,000 employees across 70 countries, the company serves government and private-sector clients worldwide. The company's new Northern Virginia hub is scheduled to open in early 2027.

"Amentum's investment in our new Northern Virginia hub at Reston Station reflects the expanding opportunities of our company and where we are headed," said Amentum's Chief Operating Officer, Steve Arnette. "This modern headquarters, featuring a next-generation Technology Showcase, will bring our teams together and serve as a destination for customers to experience our advanced engineering and technology solutions firsthand. Ultimately, the new headquarters strengthens our ability to deliver integrated, critical mission solutions aligned with global demand and government priorities."

1900 Reston Metro Plaza is a sixteen-story Trophy-class office building that is LEED-Gold certified and offers immediate access to Metro's Silver Line. The building, uniquely designed by world-renowned architect Helmut Jahn, has become an icon along the Dulles Corridor and serves as the regional headquarters for Google and numerous others.

"We are extremely excited to welcome Amentum to Reston Station," said Tim Steffan, Chief Operating Officer of Comstock. "Their addition further reinforces Reston Station's reputation as a hub for innovation and the premier destination for leading organizations that are seeking an easily accessible and highly amenitized work environment.

Reston Station is among the largest and most prominent mixed-use, transit-oriented developments in the Mid-Atlantic region, spanning 90 acres across the Dulles Toll Road and surrounding the Wiehle-Reston East Station on Metro's Silver Line. It features multiple Trophy-Class office buildings that serve as the national or regional headquarters for industry leaders like Google, Booz Allen Hamilton, ICF International, CARFAX, and numerous others. Reston Station also includes two BLVD-branded, 400+ unit luxury high-rise apartment towers as well as Virginia's first and only JW Marriott – a 28-story tower that includes the world-class JW Marriott Reston Station hotel and ultra-premium JW Marriott Residences, condominiums that are setting the new standard for luxury in the D.C. region. Signature dining, retail, and wellness options include a 55,000-square-foot VIDA Fitness and Spa, Founding Farmers, Davio's Northern Italian Steakhouse, Noku Sushi, Starbucks, Tous les Jours, CVS, and more. Coming soon will be Ebbitt House, the first-ever expansion of D.C.'s iconic Old Ebbitt Grill brand. For more information, please visit RestonStation.com.

About Comstock

Founded in 1985, Comstock is a leading asset manager, developer, and operator of mixed-use and transit-oriented properties in the Washington, D.C. region. With a managed portfolio comprising approximately 10 million square feet at full build-out and including stabilized and development assets strategically located at key Metro stations, Comstock is at the forefront of the urban transformation taking place in the fastest-growing segments of one of the nation's best real estate markets. Comstock's developments include some of the largest and most prominent mixed-use and transit-oriented projects in the mid-Atlantic region, as well as multiple large-scale public-private partnership developments. For more information, please visit Comstock.com.

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publicrelations@comstock.com

Comstock Welcomes Amentum to Reston Station