It's terra1jv65s3grqf6v6jl3dp4t6c9t9rk99cd8pm7utl

How do I determine it? Well, first I find the largest wallets (the logic is that the treasury should be worth tons) with 0 Luna Staked since the first day it has a balance, which result in the table below. Lo and behold! There's an address with the name being reward commission distribution. According to the docs, the reward commission distribution is done by only by the Community Treasury.

To verify this, I tried to find out how many addresses contain the name "reward commission distribution". The result only shows one address, terra1jv65s3grqf6v6jl3dp4t6c9t9rk99cd8pm7utl, which concludes my finding.