Which civilizations have the Improved Buildings card?

British, Dutch, French, Ottomans, Portuguese, Russians, Spanish, Swedes, Italians, Danes, Aztecs, Haudenosaunee, Lakota, Chinese, Japanese and Mexicans.

What does Improved Buildings do in AoE3?

Building: hit points +40%; Ships 1 Spanish Treasure Chest; +330 Coin. The game says: "Building hitpoints increased."

Home City card

Improved Buildings

Improved Buildings (tech ID HCImprovedBuildings) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 16 civilizations, sent from the Industrial Age. Effect: Building: hit points +40%; Ships 1 Spanish Treasure Chest; +330 Coin.

Quick answers (3)

Which civilizations have the Improved Buildings card?: British, Dutch, French, Ottomans, Portuguese, Russians, Spanish, Swedes, Italians, Danes, Aztecs, Haudenosaunee, Lakota, Chinese, Japanese and Mexicans.
What does Improved Buildings do in AoE3?: Building: hit points +40%; Ships 1 Spanish Treasure Chest; +330 Coin. The game says: "Building hitpoints increased."
What is the tech ID of Improved Buildings?: HCImprovedBuildings.