Object gaia, can be captured by sending a unit over to it, indestructible.
Trading Post. Function, slowly produces one of every resource every 10 seconds. That means you will only get 6 wood, 6 food, 6 gold, and 6 stone a minute.
Reason. The game has over 53 civs that can be played on ranked. There needs to be some universal balancing. The game is completely incomprehensible at this point and there needs to be some sort of economic benefit you can get on the map that does not tie in with the civ you pick. This building could be extremely rare. Like only one or two on the map. Many maps not even having it.
The high number of civilizations and their unique mechanics can make the game difficult to manage. A rare, neutral, and indestructible economic point encourages map control rather than just base-building and civ-specific strategy.
The fight to control this building would also increase aggression, and discouraged turtleing.