The user's manual states that you can level up a city center or district by surrounding it with at least four other districts.
[A district tile] can be upgraded by surrounding it with 4 or more other District tiles. . . . If a District (the city center is also considered as a district) becomes surrounded by 4 other District tiles, its efficiency is greatly increased.
But the Borough Streets expansion's "per level" city tile bonuses imply that you can go further:
- +1 Dust on city tile
- +2 Dust per level on city tile
However, hovering over level 1 and 2 district tiles on the map contradicts the above:
- Level 1: +1 Dust from City
- Level 2: +3 Dust from City
The same bonuses apply and show up on the map for both Science and Influence. I assume the "per level" actually means "per additional level" giving +1 from level 1 and +2 from level 2. But that implies higher district levels even more.
Can a district reach level 3 and beyond?