Can anyone offer advice or feedback on their experience on how they utilize their Solo 401k to lend money to real estate investors? 

A "lease option" customer does not always take the option to buy  and she could just do that again. 

A property manager will charge a fee to place new tenants there....you're also going to have to carry utilities while the home is vacant.If the tenants are happy, let them stay and enjoy the revenue while you stash that cash to be able to re-invest it into the property after they vacate. 

Regarding HOA, I would introduce yourself to the management company and they typically have forms to fill out such as contact information and where to send the bills.Typically your closing agent on the closing statement has the first month paid for on HOA FeesAlso - confirm what utilities are included in the HOA costs

NEVER give anyone the keys until you have all move in fees, money due you in your hands and utilities (if they are to pay them) placed in their names. 24.

We didn't take the loss through the years for the original cost, just the operating cost like taxes and utilities. 

It may be accurate to say that I don't yet understand how to properly utilize the equity I've built in my properties, but I plan to learn.

They usually pay all utilities.

They will ask for telephone bills, rental history, utility bills, etc. to show you make your payments on time. 

If you pay all your rental bills thru this account (I would pay your personal portion of rent/utilities to this account each month.