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Make your neutral upgrade building a shop selling items
Those items represent the tech
You make a trigger that increases techlevel when a item is sold
you just have to compare item-types and then decide which item type increases which tech
If a building is upgrading and some other player bring a hero near by would cause some problems. You should just use items, whenever the player buys that item, remove it and add a countdown timer so that after it reaches 0 you can trigger the upgrade.
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