I'm sure there are agents and investors with deeper insights, but for most of us, a consistent, long-term approach—similar to dollar-cost averaging when investing in index funds—seems like the most practical strategy.That being said, I am also interested to hear what others have to say though, so thank you for the post!

I have sent another email to Meagan asking for any update on funds invested. 

They can provide quick access to funds for renovations.2.

I have seen it and funded it for others or my own account.

You mention using the funds as a down-payment on a property. 

Condo does not come with land, not a great investment property option, usually most people start with 2-4 unit properties or house hack them.Personally, if i was just starting and I wanted a San Francisco property I would use the cashflow from my midwest rentals to fund it.  

You could pay them a flat interest rate on the funds they contribute, similar to a private lender, or offer a percentage of the profits to align their success with yours.

Additionally, you could not move your Roth IRA funds into a Solo(k) because for some reason unknown to even the Department of Treasury (I asked them) Roth IRAs cannot transfer into the Roth bucket of a Solo 401(k).

The way I see it is 25% down out of state means $100k in down payment/closing cost to obtain turnkey property that gains equity similar to an IRA or 5% down managing a renovation in the property your living in which in turn pays yourself from the equity gains which allows you to get to multiple house hacks very fast. 

Affordable housing, which means Fed funds, is a very tricky type of development for everyone involved.