There are many options, so instead of me listing a million things, it would be more helpful if you could lay out a few options you're considering, and I can provide some feedback from there.

What financing options are available when partnering with a solo 401(k)?

Quote from @Chad Clemons: I wouldn't recommend it.Lease option can be lucrative, but you really need to know what you are doing.

New construction is also a solid option because everything’s brand new, and you’re less likely to run into issues with maintenance early on.As for research, I’d focus on the local economy and rental demand.

The headache of playing peacemaker between 3-5 unrelated tenants doesn't sound worth the premium management fee; not to mention rent by room generally brings in lower quality tenants which require significant more management.With that said, higher rates are pushing investors toward rent by room simply because it's the only option for cash flow (at least in Denver) which is why I have so many folks reaching out.If you currently have rent by room investments or perhaps you're a PM currently offering rent by room, I'd love to hear your feedback and any advice you may have. 

One option is to give the front house a credit for water based on averages, but I don't know if I would agree to that as a tenant. 

Hello all!I'm an experienced investor that's emerging from a difficult period. Need input / ideas / comments on following pls.I have 2 SF rentals that I'm facing foreclosure on as I fell behind w/ the mortgage payment...

Just looking for other options to get started with the combo package.  

There was also a guy who pitched their stock option trading program.

Sounds like seller financing or partnering with someone are your best options.