Interest rates may vary based on creditworthiness and your deal.

So @John Underwood @Jeffrey Donis advice about credit worthiness of potential tenants is spot on.

Depending on the type of investor financing you are seeking, credit scores/creditworthiness is certainly one of the several factors you will be quantified by (hard money being the exception).

A few credit blips may be fine, but if there are credit issues, there must be documented evidence of disclosing a path for the borrower to overcome these issues so that they will be credit worthy by the time any balloon payment is required.

I will be living in & rehabbing one side and have already rented the gleaming side out to creditworthy great people for $1,550!

I guess I'd get a broker that specializes in those types of properties (ie not a apt broker) and knows the market.Since sounds like you're buying a lease with a prop attached two things:1) Read the lease AND UNDERSTAND IT (ask broker for help) and look for:    a) Creditworthiness of the biz    b) "Outs" for the lessee, like rent holidays or ways to leave    c) Underlying strength of operation - If it's slow they want to downsize and if great they may want a bigger place / better location2) Building - If they leave, can  you re-rent it easily?

Private Money / Hard Money loansthis involves proof of funds letters that are often not worth even the paper they're written on. an investor-friendly agent is likely to be okay with working with private/hard money and the shady proof of funds letters (rather than VODs to show actual cash savings or mortgage pre-approvals to show creditworthiness already guaged by lender/s).2.

What I can say is that all lending institutions have very different criteria for evaluating creditworthiness. 

If you're looking at a property that has current or potential cash flow (farmland or any type of ground that is generating lease revenue or can be developed in a way that will generate revenue), you can usually find a lender somewhere, assuming you're creditworthy, the deal is substantial enough and the property's value is verifiable (many agricultural lenders are into this kind of thing).Financing land gets much more difficult when you're dealing with smaller, vacant, residential lots - the type that isn't worth much and can't/won't generate revenue in any capacity.

Finally, you can consider a hard money loan, which is based on the property's value and not the borrower's creditworthiness.