DC's last pre revolutionary war building.........the oldest in the city.............

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   Old Stone House  

   Museum in Washington, D.C., United States of America
3. The Old Stone House is the oldest unchanged building in Washington, D.C., United States. The house is also Washington's last Pre-Revolutionary Colonial building on its original foundation. Wikipedia
5. Address: Washington, DC 20007
7. Area: 17,420 ft²
8. Opened: 1765
9. Hours: 

   Open today · 12:00 – 5:00 pm
10. Architectural style: Vernacular architecture