Faced with the same problem I had to begin with, credit scores aren't great and don't have a qualifying cosigner for any type of traditional loan, mortgage or any type of equity refinance or HELOC, right now at this moment.

To maximize cashflow, I looked in my local area (on Zillow) to find favorable Rent to House Price ratios. 

Some will be ok in 2nd position and some will not and force you to refinance out the first - but those are options that are probably cheaper than credit cards 

I was working with a local credit union who pulled out at the last minute.

@Helena Goyvaerts rate for a 30-year fix would be at least 8.5% with some points (1% of loan amount).Most DSR lenders have a minimum credit score requirement from the applicant.

I have broken down 4 key benefits to a retirement account: 1) Compounding interest in the absence of taxation (particularly with a Roth IRA) 2) Ability to self-direct into alternative assets, like real estate, private real estate partnerships/syndications, crypto, gold & silver and other alternative investments. 3) Credit protection (see state specific laws), but generally inherent protections. 4) Upon death, if setup properly, probate avoidance 

Also credit score 680 with no missed payments over the last 2 years and also check their criminal report just to make sure you know who these tenants are, as the eviction process in New York city is very long and expensive. 

Was it included as a credit/debit on the HUD so it should have reduced your cash to close? 

@Kyle TrotmanI would suggest speaking to local banks, and credit unions.

Based on your numbers, and assuming you have a credit score high enough and have never filed for BK, you shouldn't have an issue getting approved for an HML to buy/rehab the property that I would estimate at about $370k-$375k (which includes 100% of the rehab costs).