Then, in June, the renovated tower came to life, flashing giant Chinese characters that some in Hong Kong saw as a warning.
"People's Liberation Army," it said.
Many in this prosperous city had already feared that Hong Kong's future as an open society as well as a semiautonomous part of China was in jeopardy in the face of perceived growing intervention from Beijing.
Now, after the Chinese military building had kept a low profile for years, its brief debut in the city's beloved "Symphony of Lights" felt like nothing less than a show of force 17 years after the British handed the territory back to Chinese control.
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"It's a logo of red Chinese colonisation," said Billy Chiu Hin-chung, one of four people arrested last year after storming the army building while waving Hong Kong's colonial British-era flag.
From the sweltering streets of this legendary port city of 7.2 million people to its air-conditioned office towers, Hong Kongers are indeed picking sides in a looming battle over their city.
People here have long prided themselves as providing a stable, sophisticated alternative to Communist China that despite its small population enjoys the world's 36th-biggest economy and runs the globe's sixth-richest stock exchange.
But now, Hong Kongers say the soul of their society is coming under attack as they see the flood of cross-border Chinese shoppers (dubbed "locusts" for their voracious buying habits and supposed bad manners) and grow wary of the Communist Party's rising sway with top officials.
Chief Executive Leung Chun-ying, who was hand-picked by a committee of mostly pro-Beijing elites, recently asked China's legislature for constitutional changes to allow the territory to pick its own leader.
However, his report said "mainstream opinion" wanted the committee to again pick candidates, setting the stage for a confrontation with democracy groups.