Is the level 2 of that building supposed to be a one time bonus to the units you have out or a persistent effect? As I would've imagined it would be persistent seeing as you have to dedicate two more Urchins to get it, but it runs as a one time bonus? Just curious if this is the intended design.
[Edit] Weird, I just played another round where it played persistent. Either I lost an Urchin in it during that game and didn't notice, or for that one game it didn't play persistent powerup.