How much does Fortified Cities cost in AoE3?

3,000 influence, 30 seconds (AoE3: Definitive Edition 100.19.18309).

What does Fortified Cities do in AoE3?

Palace: hit points +50%; Town Center: hit points +50%; Command Center: hit points +50%; University: hit points +50%. The game says: "Palace, Town Center and University hitpoints improved."

Technology

Fortified Cities

Fortified Cities (tech ID DEFortifiedCitiesHausa) is a technology in AoE3: Definitive Edition 100.19.18309 costing 3,000 influence, 30 s to research at the Town Center. Effect: Palace: hit points +50%; Town Center: hit points +50%; Command Center: hit points +50%; University: hit points +50%.

Quick answers (3)

How much does Fortified Cities cost in AoE3?: 3,000 influence, 30 seconds (AoE3: Definitive Edition 100.19.18309).
What does Fortified Cities do in AoE3?: Palace: hit points +50%; Town Center: hit points +50%; Command Center: hit points +50%; University: hit points +50%. The game says: "Palace, Town Center and University hitpoints improved."
What is the tech ID of Fortified Cities?: DEFortifiedCitiesHausa.

Palace, Town Center and University hitpoints improved.

What it does

Palace: hit points +50%
Town Center: hit points +50%
Command Center: hit points +50%
University: hit points +50%

Cost: 3,000
Research time: 30 s
Game ID: DEFortifiedCitiesHausa

Researched at

Town Center

Needs

Industrial Age

Civilizations

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