Vostra Tower is located in Mumbai, India.
2 days after people: Power goes out.
50 years after people: Vostra Tower is covered in greenery. Without humans, the cleaner doesn't wash after the power failed 5 decades earlier.
100 years after people: Vostra Tower is now weak. A magnitude 8.2 earthquake strikes Mumbai, but only the top collapses. The rest refuses to collapse, even though it's weak.