Will there be a new Most Expensive Building by the end of 2050? (~$120 Billion)
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Ṁ176
2051
72%
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Current record is ~$120B for The Great Mosque of Mecca King Abdullah Expansion Project

Link: https://en.wikipedia.org/wiki/List_of_most_expensive_buildings

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Does "The Line" count as a single building? If so, and if it is completed, it would likely take the lead.

The Line, Saudi Arabia - Wikipedia

@TimothyJohnson5c16 if wiki counts it, yes. here is the definition they have

In the following, a building is defined as a structure with a roof and walls that stands permanently in one place. Airports are excluded as their construction cost includes runways and systems; however, terminal buildings are included in the list.

@TimothyJohnson5c16 based on that idk if they would count the line as one or multiple buildings