I purchased this 5 Unit building for $140,000, and I used the equity from one of my SFH rentals to come up with the Down Payment!

1) make the payment directly from my HELOC account2) transfer the money from HELOC to business checking account, and then make the payment from my business checking account.

If you can manage the payments, it could be a good idea to hold on to it until prices raise and you can sell for a profit.

The current interest rates 6.9%-7% kill my numbers for an investment property because the mortgage payment already comes out to $1,300 a month with the big 4 included.

Without tying up all my cash, what avenues should I pursue to cover the $72,400 cash payment I will need to make the deal happen on top of taking over the current owners loan?

Even with rates where they're at lenders require you to have a certain ratio on the payment of rent vs mortgage.

You're probably buying at higher rates, but just run the numbers, see what you can afford, and compare potential monthly payments to what you could get in rent.

The payment is $2,196 with my current insurance.

1) make the payment directly from my HELOC account2) transfer the money from HELOC to business checking account, and then make the payment from my business checking account.

“In the UK ‘more than a million households will see a significant jump in monthly payments’ this year as ‘the next batch of UK homeowners to have their mortgages repriced are preparing to make personal sacrifices”(Bloomberg).