Buying a Quadplex without a real estate brokerage? Pros vs Cons

[Amir B.]

Hello,

I found a quadplex fully rented for $2,400 monthly. The ask is $175,000. The seller is selling himself. I rather not pay the 3% commission either. 

I have never done this before. Any advice for or against doing this transaction?

Thank you,
Amir