So, here are the basics based on my market, which is AZ.  

Hi BiggerPockets Community,My name is Yael Doron, and my husband, Ido, and I are real estate investors based in Israel.

Since you know what you need to buy it at and an average rehab cost, I would say $50-70k for a cosmetic flip, set the ARV based on the sample you choose and doing comps and ask them if they would invest in a deal similar to this. 

Quote from @Brandon Croucier: Financing a commercial MF that runs as an STR is possible.Appraising a property based on the income is not, whos to say a buyer would STR the property. 

There are way better people to talk to that are based out of here and know the market like the back of their hand. 

Annual fee $25.PenFed - max 3 other properties, 89% LTV Regions- yes HELOC but no LOC SCCU Florida 70% LTV, 6.25% interest only, not LLC Sound CU "non-owner occupied HELOC, capped at $150K and interest rates are prime + 2%, 3% or 4%, based on credit, not to exceed 70% ltv.”TD Bank TIAA Direct was EverBank Tower FCU, all states except TX, max 45 DTI, green card ok.

Based on the above points, you asked us (experienced investors) what would WE decide.  

Alternatively, your sibling might use a 1031 exchange to defer taxes by reinvesting in like-kind properties, though this doesn't directly fund a primary residence.Other ideas include leveraging a HELOC on the rental properties for the down payment, taking out a 401(k) loan, structuring an owner-financed agreement, or a lease-to-own arrangement.

Do you know an approximation of how much the cost segregation with speed up the depreciation, ie 30% of depreciable base(price minus land)?

If they try to pay their labor as 1099 they run at great risk of violating a host of draconian labor laws such as AB5, the borello law and a litany of "misclassification" laws.There are substantial differences in how "right to work" statstate as operate as opposed to "non right to work" states.SBA defines a small business based on employees and revenue size.