[Expansion Possibility] Base building adjacency bonuses?

[The Apprentice]

I don't know how feasible it is, but if each building type got a an adjacency bonus (checks buildings in four isometric directions adjacent) for having buildings of the same type next to each other, it would add a fun layer to base building.

For example, perhaps if you had 4 purpletonium plants surrounding a purpletonium plant, it would transform to a higher tier with +X% energy bonus. Could be capped at one per base, like wonders? We know everyone likes wonders.