What to know before buying a 5+ unit apartment building?

[Tedros Fremichael]

Hello, I am considering buying a 6 unit apartment building so I'll need a commercial loan and this is my first building. My question to all experienced investors is what should I know when seeking a loan and the process. I am a full time residentail real estate agent and I own a home possibly looking to pull equity from, I have around $50k cash and plan on pulling money from a 401k for a down payment. I also have a co-signer if need be. The building Im looking to acquire makes $6150.00 a month. Just looking for advice and guidance. Thanks