The east portico extends the full length of the Mansion, and its roof is supported by eight square wooden columns reaching a height of two stories. An ornamental balustrade surmounts the porch roof and adds height to its pleasing effect. The tiles with which the floor is still paved were imported from England by Washington and laid in 1786. In 1915, 1512 tiles were obtained from the original quarry to replace those so badly worn as to be unsafe. The dimensions of the pavement are: length, 95 feet 5 inches; width, 14 feet 6 inches, and, according to Washington’s own measurements, this pavement is 124 feet 10½ inches above the river level. The columns and balustrade are faithful reproductions of the original, the foundations of the building have been strengthened, weakened timbers renewed, and steel girders hidden between floors and ceiling for increased stability.

In 1895 accurate architectural drawings of interior and exterior details were secured by Mrs. Mary T. Leiter, late Vice-Regent for Illinois, and placed in safe deposit vaults in Washington.

In 1909 a skeleton model of the Mansion, showing its unique construction, was lodged for safe keeping with the National Museum.

The outlook from the porch commands extensive and picturesque views of the broad Potomac.