"Increases your Settler limit from 25 to 45."
In-game description

Galata Tower District is a technology in Age of Empires III that is unique to the Ottomans and can be researched at the Mosque once the Colonial Age is reached. Once researched, it increases the train limit of Ottoman Settlers by 20 – from 25 to 45. Topkapi is the further upgrade of this technology.

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