While many people disagree I think it is very possible. By looking at the extent of damage in Portal 2 I would say it is very feasible for that level of damage to occur during a 20 year period.
For my argument I will bring up two points
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Chernobyl: This country was abandoned on the date of April 26th, 1986 due to a nuclear meltdown. The level of damage due to the lack of maintenance from the abandonment of people is currently at a 25 year period.
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History Channel video that originated from t.v. series “Life After People.” About 5 minutes long. Speculates level of damage from abandoment ranging to 150 year long period (jumps from 6, 10, 60, then 150 years.)
20 years is more than enough time for plant growth to completely take over something as confined as Aperture labs. without any sort of maintenance plant life takes over which thus causes cracks in walls, concrete, etc. Running water which then is frozen and thawed constantly would widen cracks and of course weaken the structure of the building thus giving the old Aperture look.
You are free to disagree with me. While the video I provided only covered 10 years (then jumped to 60 years for unknown reasons) I would imagine that 20 years would look twice as bad as ten.
If Aperture labs was indeed that old the weather conditions in the location of Aperture would cause Aperture labs to crumble (merely due to rain causing cracks in the cement which thus forces the weight of the earth to crush the Facilities.) Moreover the technology certainly wouldn’t work that far into the future. Jet fuel I believe has a shelf life of 10 years. A computer such as GlaDDOS wouldn’t function at all.[/SIZE]
Sources
1.History channels “Life after people” video
https://www.history.com/shows/life-after-people/videos/grand-central-station#grand-central-station
- Website I found about Chernobyl
https://englishrussia.com/2006/09/13/lost-city-of-chernobyl/
Feel free to speculate or to discredit any sort of inconsistencies or any known and unknown issues upfront.
THE END
MY OPINION