Personally, i would have accepted this 12 months offer but not with major discount but some minor compensation (of course much more than the average bank interest rate):)Also you will have to draft out a quote in the agreement for pro-rata payback if the deal fall through midway through the year

Once the plan is confirmed, the trustee will make pro rata payments to all the creditors, which include the arrrears on your loan.Also, look up the case in PACER.

Solo-K would be my preference since this will allow me to avoid tripping the pro-rata rule when I make my backdoor Roth contribution/conversion every year.My question is, which self-directed provider to use?? 

If the whole building is owned by the condo owners then they'd have pro rata land value.

In other words, whatever entity you choose (LLC, LLP, C-Corp) will have an operating agreement spelling out how pro-rata profits are distributed.

The first year, will I pay a pro rata share of the long term capital gains and recapture taxes of the principal portions of the mortgage payments plus the money down?

If that tenant ever goes out the second or third generation tenant might not be national but regional or local in nature and if NNN and taxes are really high above base rent you might have to go lower on rent to land the tenant.If this is a strip center with NNN leases then the leases typically state the tenants WILL ONLY cover their pro-rata share of property taxes,expenses,etc.Example if you had 6 tenants in a building and then 2 go out the other 4 tenants do not want to shoulder the expenses for (CAM) property taxes, maintenance, and management fees above their base rent for spaces they do not occupy and do not generate sales out of.What you do is check BEFORE while under LOI or PSA with a local tax attorney who challenges and appeals the property taxes to see what is the custom for after a sale.

I assume the investors don't want to be in 2nd or 3rd position on a mortgage, and a tenant-in-common isn't ideal either.Is there any way to do this without having to create a separate LLC for each property and divide the owndership of the LLC pro-rata to their investment?

If there is an early termination clause you need to make sure tenant has to give 6 to 12 months notice minimum to terminate and they need to reimburse pro-rata share of any TI landlord gave when they first moved in  plus so many months rent for a fee.

Syndicates offer essentially the same tax benefits of sole ownership, as all of the income/expenses/deductions pass through to the investors pro-rata.