What documentation is required to get a loan against a condo?

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We own 3 condos that were converted from a Triplex property during our ownership. As we have owned all of them, we haven't done much beyond getting CCRs drawn up. My question is about getting a loan against a single property. I'm thinking of a HELOC, refi or second. What condo-related documents would a lender want to see in in that process?

Budget?

Business Checking Account?

DBA?

I just want to start the process as prepared as I can be so I don’t look like the newbie that I actually am.

PS. I may also post in other relevant forums.