I just had to take extra money out of my personal account and funnel into my rental account. 

There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

You can fund it with funds in former employer plans and/or IRA accounts.  

In my opinion, $90,000 is too little capital to invest in real estate within a retirement account plan.LTV's are lower when investing with a retirement account plan - Around 65%Meaning if you were to use $60,000 as a down payment, you would likely only buy a house around $70,000.$8,000 would likely go away in closing costs.

So, if she bought the bitcoin for $1 million and is now using it to close on a $10 million property, that is a $9 million gain that needs to be accounted for in her income tax.

Same thing for the size of the Heloc but you'll get better terms on the Conventional vs Heloc.

Yes, but your "highest and best use" is being an accountant to your clients, not handling the minutia of your RE portfolio!

He also does solar deals that are out of this world in Hawaii but you need to be a Hawaii resident to get the full benefit.. what size are those developments?  

They don’t charge anything for these extra accounts, my tenants pay directly into those accounts.

Vet your contractors and hold them accountable.