Most web searches for solo 401k come back with self-directed IRA sites.Rick, this subject has been discussed at length here on BP forum.

For this reason I have budgeted 8-10% of the rent too.When I contradicted the sales guy on those he came up with the following statistics:Maintenance: On our 2700+ properties under management, the average maintenance was sub 4% last year.Vacancy: Our average tenant length of stay is 36 months.Rents: This is a statistic that we track monthly, and it hovers between 95-97% of our properties that rent at the high end of the rent range that we give our investors on the front end.

This can reduce the length of the loan by six or more years and shave off tens of thousands (or even hundreds of thousands) of dollars of interest over the life of the loan, depending upon the loan amount and interest rate."

I would make sure to look at "arm's length transaction" rules.

There are issues with transferring the loan (due on sale) or reselling the property to your business (possible arm's length issues??).

Right around a year is the length of ownership.

Can proof of the low-income housing use/length be designated by a lease contract dated/signed with the section-8 authority and the low income tenant?

I know there are certain arms length type restrictions. 

I tend to adjust the length of the leases to meet the expiration dates I’m looking for.  

As he will maintain "arms length" from the project, I believe we have satisfied the first criteria as an eligible investment for a SDIRA.