In Whitemarsh, just north of Philadelphia, on Pennsylvania Ave.
The Lon/Lat coordinates of the historical marker are N 40.12415°, W 75.19233° (I believe the actual house is down the tree-lined driveway and to the right).
The Emlen House was built by George Emlen III (1718-1776), and briefly used as George Washington's headquarters in 1777.
More recently it was owned by Polish-American millionaire Edward J. Piszek until his death in 2004. He bequeathed the property to the Copernicus Society of America (founded by Piszek). In 2015 the house was renovated and sold.
Related Links:
ExplorePAhistory.com has an older photo of the house
Photos of the Emlen House on flickr.com
Drawing by Henry Ogden Alexander
The Emlen house is undergoing extensive renovations in 2015:
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