The biggest question you have to ask yourself is how will you sleep at night?

You might be able to get a cheaper loan than just FHA type loans (biggest impediment to FHA loan is that mortgage insurance never goes off). 

But in the end scale is the biggest difference for me of why you would do MFH over SFH. 

Your biggest assets in your 20s are your time and energy.

There's a lot of discussion around partnerships, private lending, and hard money, but I don't see much discussion on the actual mechanics - what these arrangements look like in practice.My hope is this post can serve as a reference for those starting out, so we may get a better understanding of how these strategies are actually implemented as well as an ability to more accurately predict the profits and returns you and your lenders and partners can expect.If those with more experience would like to revise these numbers and statements, it would be most appreciated.These scenarios assume you, the flipper, are bringing none of your own capital to the deal.Typically, this would mean 1 of 2 scenarios...Private Lending - Someone you know brings 100% of project costs (purchase, rehab, acquisition costs, holding costs) to complete the deal and in return, they get a certain percentage return which comes out of your profit.Hard Money + Partnership - You get a hard money lender to cover 80-90% of purchase+rehab and a partner to cover the remaining 10-20% as well as acquisition costs (including hard money origination and points) and holding costs (including hard money interest payments).An aside about the structuring...Private Lending - A promissory note is created, and your private lender lends to you or your business. 

The last I checked (several years ago), only 5% of all retirement accounts are self directed but in the Information Age, more and more are becoming aware.On the other side, I have been a borrower of private Investor funds with many using self directed accounts and I can assure you that some of the advice above recommending the timing of your custodian is crucial is absolutely correct.

Your contractors will be the second biggest determining factor in your success (other than buying at the right price). 

They are very unlikely to call the servicing department and say anything (It could get them in trouble for divulging your private information.)

Well I came across one that I am curious on everyone’s opinion, the number make since but my biggest concern is vacancy for this property.The reason vacancy is my concern, it is in a very small town(approximately 2500 people), the next closest city is about 10-15 min away of about 55k.

The first one is always the biggest and you learn the most.