That's how the banks do it.

Raising money is all about marketing and sales (not real estate specific) so either hire marketing agency and read sales books, or hop on some LinkedIn courses on marketing and sales.Not sure the legal structure to use: talk to accountants and attorneys.Need deal flow: talk to brokers and go to a lot of networking events.Lending terms: start calling banks and loan brokers.From there, it is all risk mitigation. 

Alternatively, if the bank ( assuming there is a bank) is fine with it, you could negotiate a credit and escrow the funds to be released after you do it yourself.  

Just like a bank tells you what the terms are, not you as the buyer.

-Local banks were the best.

The bank will make you leave 25% equity in the property - but you also still want the property to at least cash flow some - so be careful how much equity you pull out / new debt you take on.I would do a cost benefit analysis of what your actual gain is in cash-flow on buying a new property with a (currently) higher interest rate (if financing), versus just holding on to the current appreciated property and enjoying that cash flow.All the best!

I've also used traditional loans through regional banks and a few SBA loans. 

It would be far simpler to put the $500,000 in a bank account owned by the LLC and you immediately own a fixed percent.

You might find a local credit union or community bank that will go to 95 -100%.At one point I called 2 different VA Regional Loan Centers regarding this section in the VA lenders handbook:Assumability - The second mortgage should not restrict theVeteran’s ability to sell the property any more thanthe VA first mortgage.

If you go with the partnership route1) You need to manage the money going in and out of the business bank account.2) File a partnership return and be responsible for issuing K-1's3) make distributions to you and your partner for cash flow that you receiveYou will likely spend many hours on a nice gesture.I may want to consider instead to give a christmas gift or a bonus for early completion of projects.