Im amid the pre-qualification process at a local bank, and heard back that the lowest down payment they offer for a primary residence loan on a small multi-family property is 15%.

Here are the Fannie Mae guidelines for legally non-conforming properties:If the Property's characteristics are legally non-conforming, you must:ensure the Borrower executes the Modifications to Multifamily Loan and Security Agreement (Legal Non-Conforming Status) (Form 6275);confirm whether, if fully or partially destroyed, the Property's Improvements can be fully rebuilt to the pre-casualty condition per current laws, zoning requirements, and building codes; and if the Property’s Improvements cannot be fully rebuilt to the pre-casualty condition, evaluate if the as-rebuilt Property will support the Mortgage Loan at the current Tier, and document your analysis in the Transaction Approval Memo.To assess the Borrower's ability to rebuild Improvements on a non-conforming Property to a level that will support the Mortgage Loan at the current Tier, you should consider: conducting a threshold analysis to determine the resulting actual amortizing DSCR if the reconstructed Improvements cannot be rebuilt as-is per current law; the likelihood of a casualty event (e.g., wind, earthquake, fire, flood, mine subsidence, etc.); the percentage of damage to the Improvements at which the Property’s jurisdiction will require the Property be rebuilt to current zoning and land use requirements (i.e., the destruction threshold); which Property characteristics the destruction threshold percentage applies to, such as market value, assessed value, replacement cost, or unit count; for Properties with multiple buildings, if the destruction threshold percentage applies to each building, or all buildings as a whole; the replacement cost to rebuild per current requirements for zoning, and land use; the Property’s continued marketability, and economic viability; the amount and type of Borrower-maintained insurance coverage required per Part II, Chapter 5: Property and Liability Insurance, Section 501.02C: Ordinance or Law Insurance; insurance loss proceeds payout, compared to increased rebuilding costs, including from building code changes, Americans with Disabilities Act compliance, and the municipality's local zoning requirements (e.g., green compliance for new buildings, etc.); the sufficiency of estimated insurance proceeds from ordinance or law insurance and other coverages to repay the Mortgage Loan in the event of partial or full casualty, or condemnation; and for a Tier 3 or Tier 4 Mortgage Loan, if requiring execution of the Limited Payment Guaranty (Form 6020.LPG) would mitigate the risk of the as-rebuilt Property not supporting a Tier 2 Mortgage Loan.

Need to get pre qualed then go shopping with your pre qual letter or your bank statements.  ???

I am curious if there are any pre made criteria lists out there or if there are any “must haves” for tenant screening. 

I have no pre-qualification letter.

But, generally speaking the 3 month seasoning products are pretty terribly priced with 3-5 year pre-payment penalties. 

and credit score of 750+, so I presume getting pre approved as a first time buyer would not be all that difficult.

Personally the only thing I find awkward about it is that you have to "invite" people to fill out the application or pre-application by their email or phone, I'd rather have a link to apply that I could post on my listings rather than have people message me then I have to collect the email, then send them the application, but that's just a minor inconvenience for me.

Agreed about the credit but my plan would be to pre pay the full amount out of proceeds...  . 

Make sure you have pictures and all agree on what pre-existing damage is acceptable.