The condominium project known as the Gymnasium at National Park Seminary in Silver Spring, Maryland is one of the most high-profile projects in our portfolio. The historic Silver Spring, Maryland gymnasium building was constructed in 1907, and served the student body of an all women’s finishing school known as National Park Seminary. The property was later used to rehabilitate wounded veterans and later facilitate medical research.

The completely restored building, which resembles a Greek Gymnasium, now features upscale condominium units.

About Washington LandmarkWashington Landmark is owned and operated by Trevor and Karl Voglmayr:


Gymnasium, before photos


Gymnasium, before photos


Gymnasium, before photos


Gymnasium, before photos


Stairwell, in-progress


Stairwell, in-progress


Gymnasium, kitchen after


Gynasium, completed


Gymnasium, completed, night view

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Karl Voglmayr

J. Karl A. Voglmayr “Karl” is the founder of Washington Landmark Construction LLC (WLC), a DC-based real estate development company specializing in the construction of single family homes and restoration of multi-unit historic buildings. In a relatively short-time, Karl has made WLC an award winning firm while at the same time expanding his career from design and construction to teaching. He is presently an adjunct professor at Georgetown University’s School of Continuing Studies where he brings his expertise in all phases of real estate development acquired from close to 30-years’ experience in the region’s construction and development industry.

In 2017, WLC won the prestigious Montgomery County Planning Department Design Excellence Award for its innovative design and construction of the dilapidated 100 year-old Grecian-styled gymnasium at the National Park Seminary (NPS) in Silver Spring, Maryland. Prior to this award, the now 12-unit state-of-the-art condominium complex received the county’s 2015 Historic Preservation Award for its modernizing design approach, which executed successfully the adaptation of the Grecian architectural design to accommodate modern conveniences. Presently, WLC has undertaken a similar project to convert the Power Plant at NPS, which consists of three historically designated buildings – the Power Plant, Practice House and Fire House – into 14 distinctive condominiums.

Karl began his real estate career as a superintendent for Trammell Crow Company, the largest commercial real estate developer in the United States and became one of its youngest project managers before founding Washington Landmark in 1992. He has constructed more than 20 unique architecturally-designed single family homes in the Washington, DC area for clients. On the development side, Karl built or repurposed numerous buildings, which include high-rises, boutique condominium buildings, and numerous single family home conversions.

Karl graduated with a Bachelor of Arts degree in Economics and Comparative Politics from Clark University in Worcester, MA and holds a Master’s in Administrative Science from Johns Hopkins University in Washington, DC. Karl resides with his wife, Lorrette and their three children: Alexander, Bridget, and Peter, in the District’s American University Park neighborhood.


Trevor Voglmayr

Trevor provides site supervision and works closely with our sub-contractors. Trevor resides in Cabin John, MD, with his wife Kathy and their two children. Trevor is adept at maximizing space, and provides essential insight into the design process. Trevor’s technical know-how is un-matched in the industry.

What to Expect

It is our pleasure to turn your space into your dream. Realizing that construction projects can be stressful, we strive to complete our projects on time and we offer multiple contacts to our firms managers so you can get your questions answered quickly.

Read on to learn more about our process: