All of these heights are based on the new Google Earth 3D imagery for Washington, DC.
New Executive Office Building
Building:
https://skyscraperpage.com/cities/?buildingID=79441
Height (roof):
50.3 m (Measured from southwest entrance)
World Bank Headquarters
Building:
https://skyscraperpage.com/cities/?buildingID=40795
Height (roof):
54.9 m (Measured from north side entrance to both north side "pinnacle" and top of arched roof area, roughly the same height above street level)
Post Massachusetts Avenue
Building:
https://skyscraperpage.com/cities/?buildingID=79421
Height (roof):
48.2 m (Measured from west side entrance)
One City Center
Building:
https://skyscraperpage.com/cities/?buildingID=78247
Height (roof):
39.6 m (Measured from west side entrance)
Two City Center
Building:
https://skyscraperpage.com/cities/?buildingID=78246
Height (roof):
41.8 m (Measured from southwest corner)
1101 New York
Building:
https://skyscraperpage.com/cities/?buildingID=47321
Height (roof):
49.1 (Measured from south side entrance)