None but u have to destroy Invaders for that i think the free Building Space generates new studys to Build
To expand on this, Destroyed Gold: when an ally gets hired and you do not collect the gold, that gold is said to be uncollected. Uncollected gold can get destroyed when another person successfully wins an attack. The formula for the amount of uncollected gold is as followed. Over cap resources minus carry capacity, and the remaining carry capacity (that is not carrying over capped resources) can destroy an amount of uncollected gold equivalent to the remaining carry capacity but not exceeding 10% of the total uncollected gold.