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Metropolis&Megalopolis Upgrade – Enhanced City System-Buildings Expansion

⭐ Metropolis&Megalopolis Upgrade – Enhanced City System-Buildings Expansion
Megalopolis Upgrade – Enhanced City System expands the vanilla city progression by adding a new location rank between City and Megalopolis: Metropolis.


This mod expands Europa Universalis V with a complete late-game urban development layer,
featuring 22 brand-new Metropolis and Megalopolis buildings — each with its own icon,
unique bonuses and immersive role in city specialization.

🏛 Metropolis Buildings
Metropolitan Port Authority
Central Industrial District
Metropolitan Academy of Sciences
Metropolitan Guard Headquarters
Metropolitan Council Hall
Metropolitan Tax Office
Grand Opera House
Public Health Institute
Urban Sewer Network
Metropolitan Transport Hub
City Watch Quarters
Central Census Bureau

👑 Megalopolis Buildings
Imperial Stock Exchange
Complex Transport Network
High Society Club
Maritime Commercial Exchange
Mega Garrison District
Grand Observatory
Great Census Archives
Industrial Waterworks
Urban Logistics Terminal
Civic Court of Appeals

🎯 Gameplay intention
These buildings are not simple stat upgrades — they are strategic commitments.
Metropolises become centers of military power, scientific progress, administration and trade.
Megalopolises feel like imperial capitals that reshape the world economy.

⚙ Designed for late-game play
• Dramatically powerful bonuses, but not spam-buildable
• Cities must be chosen carefully — not every province can or should reach this tier
• Scaling remains fully vanilla-compatible



🛠️ Contributors
• d0sada — Debugging & Code Improvements
→ Crash fix work, reform triggers, modifier updates, and stability improvements







🌐Compatch released for Extended Authority – Forts & Bailiffs.
Fixes missing Castles / Stockades / Cathedrals inside Metropolis & Megalopolis.

🔗 https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3606624495

Load order: base mod → Extended Authority → compatch (bottom)


⚙️ Progression & Balance

Metropolis is now the intermediate step toward a Megalopolis
→ More capacity, more buildings, more population — but no hard limits.

Megalopolis becomes rare and expensive, truly representing the greatest cities in history
→ High population + high development requirements
→ 5000 gold upgrade cost
→ Expanded goods demand
→ Limited per-province (auto-downgrades if capital changes)


🧠 Province Capital System

To prevent abuse (e.g., forcing multiple Megalopolises per province):

If a Megalopolis is located outside the Province Capital,
and the Province Capital later changes, then
→ The old Megalopolis will downgrade back to a City after 1 month
(ensuring only one true Megalopolis per province)

🎨 Polish & Visuals

New custom icons for Metropolis and Megalopolis

UI text updates for clarity and immersion

Compatible with current game version.
Save-game compatible (upgrading may require one month tick).


3️⃣ Better RGO → City Transition (Community Tweaks Integration)

In the base game, promoting Town → City inside RGO provinces sharply reduced RGO % and made the region inefficient.

This mod integrates logic inspired by Community Tweaks, ensuring upgraded urban areas keep reasonable economic performance:

RGO scaling reduced only to ~80%–70% Max RGO Size instead of collapsing

RGO provinces upgrading to City/Town remain usable, productive, and logical

Much more realistic rural → urban transition simulation

This results in stronger city building, better regional development, and a more natural economic curve.


⭐ 📌 Credits
🟦 Idea Variation II – Inspiration for the Original Metropolis Rank

Massive thanks to Flogi for his excellent work.
His idea of a Metropolis rank in Idea Variation II inspired this standalone Megalopolis system.

🔗 https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3599735023&searchtext=idea

🟩 Community Tweaks – RGO Behaviour Logic

Thanks to the Community Tweaks team for their smart approach to making RGO provinces remain efficient when upgraded to Town/City.
This mod adapts that concept into its own balancing.

🔗 https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3604207425&searchtext=community


⭐ 📌 Future Implementations

New Megalopolis-exclusive buildings

Special effects and modifiers for high-tier cities

Possibly “Imperial Capital” and “Cultural Capital” variants are possible.


⭐ 📌 Feedback

If you have balance suggestions, ideas, bug reports, or improvements you’d like to see, feel free to comment.
All constructive feedback is appreciated — this mod will continue to evolve!


🌍 🌐 TRANSLATIONS & COMMUNITY PROJECTS
Chinese Translation:
Thanks to 牛奶大魔王 for making the mod available for the Chinese community.
🔗 https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3599706198

If you translate the mod to another language, feel free to comment —
we will add your link here with credits!


⭐ 📌 Compatibility

Should work with most mods that do NOT override location ranks or add any new buildings. If you have any just comment and i will try to make a patch.

Not Ironman and achivement compatible.

Safe to add mid-game (but upgrade conditions apply).