at no other point

"Unlike the Williamsburg scheme, he [L'Enfant] further connected the Capitol and the executive mansion along the third side of the triangle by Pennsylvania Avenue. It was a grandiose plan, completely lacking in scale and impossible of visual success. Nevertheless, it was a unified conception until Andrew Jackson ruined it by placing the Treasury directly across the Avenue. This was the crowning point of the civic ignominy of the civically debased nineteenth century; at no other point in the history of urbanism could such a structure as the White House have been flanked by such things as Treasure and State."

1. What does "a unified conception" mean in this context?

2. "Point" in the blue phrase means idea or a point of time?

Please help!

Thank you.

Cadzao