In "Parkinson's Law, and Other Studies in Administration", in the "Plans and Plants, or The Administration Block" chapter, Cyril Northcote Parkinson elaborates that organizations have entered the phase of decay when they come to complete their perfect headquarters.
(Actual quote: "Perfection of planning is a symptom of decay. During a period of exciting discovery or progress, there is no time to plan the perfect headquarters.")
He supports his view with examples of the years of completion of various administrative buildings and the the state of development of the respective organizations for the same period of time.
(An excerpt: "The decline of British imperialism actually began with the general election of 1906 and the victory on that occasion of liberal and semi-socialist ideas. It need surprise no one, therefore, to observe that 1906 is the date of completion carved in imperishable granite over the British War Office doors. The campaign of Waterloo might have been directed from poky offices around the Horse Guards Parade. It was, by contrast, in surroundings of dignity that were approved the plans for attacking the Dardanelles.")
While his research is not a scientific proof per se, I think it provides enough substance to consider his point worth of further examination, so as to formulate a scientific hypothesis, at least.
I am particularly interested in historical examples about the rise/ decline in power of specific political entities (political leaders/ political organizations/ political regimes/ political ideologies) and the completion of their "perfect headquarters".
A specific case study
One specific example is even more interesting to me, albeit it is not historical one, as it is not complete yet - the reign of Recep Tayyip Erdogan.
Recep Erdogan completed his "perfect palace" - The Presidential Complex in Ankara. This is one of the most remarkable buildings of this kind ever built, in terms of its scale. Can we say that Erdogan's power is in decline, though? Despite the attempted coup and ongoing economic issues, he does not seem to be in any serious decline of power, especially on the geopolitical scene. Or am I wrong?
Could you point historical examples about the years of completion of "perfect headquarters" of political entities (political leaders/ political organizations/ political regimes/ political ideologies) and their state of political development (e.g. rise/ blossom/ decline/ demise) for the same period of time?