What does Great House do in AoE3?

Town Center: damage +50%, Wood cost −25%; Command Center: damage +50%, Wood cost −25%. The game says: "Town Centers are cheaper and inflict more damage when garrisoned."

Home City card

Great House

Great House (tech ID HCXPGreatHouse) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Colonial Age. Effect: Town Center: damage +50%, Wood cost −25%; Command Center: damage +50%, Wood cost −25%.

Quick answers (3)

Which civilizations have the Great House card?: Haudenosaunee.
What does Great House do in AoE3?: Town Center: damage +50%, Wood cost −25%; Command Center: damage +50%, Wood cost −25%. The game says: "Town Centers are cheaper and inflict more damage when garrisoned."
What is the tech ID of Great House?: HCXPGreatHouse.

Town Centers are cheaper and inflict more damage when garrisoned.

What it does

Town Center: damage +50%, Wood cost −25%
Command Center: damage +50%, Wood cost −25%

Cost: 1
Sent from: II
Times it can be sent: 1
Game ID: HCXPGreatHouse

In these decks

HaudenosauneeII×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).