This would depend on loan purpose and how long you plan to hold it.  

@Justin FondrenIf your credit score is in the 700–730 range, you're in a great position to secure favorable loan terms.

We have about 1/3 to 1/2 of a down saved at the moment, have a 755 Credit score, and are feeling good.

As for non-bank loans, I'm familiar with a loan program that provides 100% financing, but it requires a minimum 650 credit score and proof of funds covering 12 months of interest.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Multifamily properties, particularly those with 2 to 4 units, can appreciate at different rates compared to single-family homes, depending on a range of factors such as location, market demand, and overall economic conditions.

I'm in good standing with a 810 credit score, no debt, and about $100k in savings.

(My credit scores are solid.)Thank you in advance for any feedback.

It would depend on what class of property / tenant you're targeting and how much you have to invest.