Boston City Hall, known for its brutalist architecture, is now an official historic landmark despite once being named the fourth ugliest building in the world.

Boston City Hall has been declared a local historic landmark for its iconic — if sometimes controversial — brutalist architecture, Mayor Michelle Wu announced Friday. The 1968 structure, sometimes referred to as one of the world’s ugliest buildings,

Boston City Hall has its admirers. And its detractors. But it’s an undeniable landmark of the city. And now it’s in writing.

Boston City Hall, a hulking example of Brutalist architecture, is the newest site to be designated as a historic landmark in the city.