All of these heights are from the new Google Earth 3D imagery for Washington, DC. Not authoritative, but should be pretty accurate.
J. Edgar Hoover Building
Building:
https://skyscraperpage.com/cities/?buildingID=82831
Height (roof):
56.7 m (Measured from main south side entrance to top of mechanical penthouse)
Coordinates adjustment:
38.89530, -77.02500
Franklin Court
Building:
https://skyscraperpage.com/cities/?buildingID=79657
Height (spire):
61.6 m (Measured from southwest corner)
Height (roof):
47.4 m (Already correct in the database)
IBEW Building
Building:
https://skyscraperpage.com/cities/?buildingID=2466
Height (roof):
47.6 m (Measured from southeast corner)
The Watergate South
Building:
https://skyscraperpage.com/cities/?buildingID=98144
Height (roof):
44.2 m (Measured from northeast entrance to top of mechanical penthouse)
Midtown Center
Building:
https://skyscraperpage.com/cities/?buildingID=107966
Height (roof):
49.4 m (Measured from central courtyard)
Capitol View
Building:
https://skyscraperpage.com/cities/?buildingID=50196
Height (roof):
45.7 m (Measured from east side entrance)