Ageless Buildings in Civilization VII are structures that, once built, maintain their effects and bonuses throughout all Ages of the game. These buildings are not replaced or made obsolete as you progress through different Ages, providing long-term benefits. Here's a comprehensive look at Ageless Buildings based on the available information:
Definition and Function:
•Permanence: Unlike standard buildings that might lose effectiveness or become obsolete when entering a new Age, Ageless Buildings retain their yields and bonuses indefinitely.
•Strategic Placement: Because these buildings are permanent, the initial placement is crucial. They cannot be overbuilt or demolished, which means you must strategize their location for maximum benefit over the course of the game.
Examples of Ageless Buildings:
Warehouse Buildings:
•Granary: Provides additional food and boosts from farms, pastures, and plantations.
•Fishing Quay: Increases food from fishing boats and must be placed on coastal, lake, or navigable river tiles.
•Saw Pit: Boosts production from camps and woodcutters.
•Brickyard: Enhances production on clay pits, mines, and quarries.
Unique Buildings:
•Ming Great Wall: An Ageless unique improvement for the Ming China civilization, offering bonuses to gold from adjacent fortifications.
•Other Civ-Specific Buildings: Each civilization might have unique buildings that are also Ageless, like Egypt's Mortuary Temple and Mastaba, forming the Necropolis Unique District.
•Wonders: All Wonders in the game are considered Ageless, ensuring their effects persist across Ages.
Benefits:
•Long-term Investment: Ageless Buildings are investments that pay off throughout the game, making them crucial for sustained growth or specialized strategies.
•Boost Rural Improvements: Warehouse buildings like the Granary or Saw Pit specifically increase the yield of rural improvements, supporting the balance between urban and rural development.
Limitations and Considerations: 
•Placement: Since these buildings can't be moved or replaced, you need to plan your city layout around them. Placing them in tiles where they can benefit from adjacency bonuses or where they logically fit in terms of resource exploitation is key.
•Overbuilding: While Ageless Buildings can't be overbuilt, the strategy of overbuilding around them with new age-specific buildings can be beneficial. For instance, building over older, less efficient buildings to make room for upgrades while keeping the Ageless Building.
•Rural vs. Urban: Some players and community discussions (like on the Steam forums) have highlighted that certain Ageless Buildings can become less effective if the city urbanizes completely, losing the rural improvements they boost. This requires players to consider how their cities will evolve over time.
Community Feedback:
•Usefulness Over Time: There's debate on whether all Ageless Buildings remain useful into late game, particularly those tied to rural improvements which might disappear in heavily urbanized areas.
•Suggestions: Some players suggest that Ageless Buildings should either provide more flexible bonuses or allow for some form of upgrade or replacement to remain relevant across all Ages.
Conclusion:
Ageless Buildings in Civilization VII are a strategic element that requires foresight and planning. They are crucial for maintaining certain yields or bonuses throughout the game, but their effectiveness can sometimes diminish if not carefully integrated into your broader city and expansion strategy.
