A traditional bank will not give a line of credit even if there is significant equity because it boils down to being able to pay back the money. 

Bossier partner managed property and repairs while we managed business structure and banking account setup.

Start by talking to your bank. 

It may create a problem for you later if your bank discovers the account is owned by an LLC that no longer exists.

This is already going on in banking.

Second to cash in the bank is HELOC cash because you can use it however you want (you just have to see it already in an account).

Many banks limit personal loan amounts.

So you better find something that cash flows or you’d be better off putting the money in a bank CD. 

This allows you to access funds while keeping your existing mortgages intact.Second Mortgage: Explore lenders who offer second-position loans on investment properties, though rates will be higher.Cash-Out HELOC : While traditional banks often restrict HELOCs on non-owner-occupied properties, some portfolio or private lenders may offer HELOCs for investors.With $15-20K in liquid funds, look for deals where you can negotiate terms:Seller Financing: Negotiate lower down payments or interest-only periods.Subject-To Financing: Assume the seller’s existing mortgage while covering the down payment.Lease-to-Own: Lock in the purchase price while using rental income to build equity.

But I guess if you want to give a bank $375,000 upfront and $10,871 a month for 30 years you are welcome to.