Completion of the sprawling Ryomyong Street development, just down a wide avenue from the mausoleum where Kim's grandfather Kim Il-Sung and father Kim Jong-Il lie in state, was repeatedly promised in time for Saturday's 105th anniversary of the birth of the North's founder.
North Korean authorities seek to present their isolated, impoverished country as prosperous and modern, and international media outlets were invited for the occasion.
Prime Minister Pak Pong-Ju lauded Kim, saying the project was a demonstration of "the 'do or die' spirit of our people and army who are willing to implement the Party's orders in all cases", he said, and "a victory against imperialists' sanctions".
The North is under multiple sets of United Nations sanctions over its nuclear and ballistic missile programmes and tensions have soared in recent weeks.
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There is speculation Pyongyang might conduct a sixth nuclear test, or another missile launch, to co-incide with the Kim Il-Sung anniversary - specialist US website 38North described its Punggye-ri test site as "primed and ready" yesterday - and Trump has dispatched an aircraft carrier group to the Korean peninsula.
"We are sending an armada. Very powerful," he told the Fox Business Network.
"He is doing the wrong thing," he added of Kim. "He's making a big mistake."
The North has reiterated its constant refrain that it is ready for "war" with the US.
The 1950-53 Korean War ended in an armistice rather than a peace treaty and Pyongyang says that it needs nuclear weapons to defend itself against a possible US invasion.
Last week's US missile strike on Syria vindicated its stance, it said at the weekend.
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