If the 123k is the original loan, what is the remaining balance?

Right now the morgage balance of that is about 480k. ■ I recently started to rent out part of the Single Family House as an STR( Airbnb) for about 2 months now and I have been averaging about $1500 per month but that is because it's been a bit slow.■ My 2 Family House I had claimed on my taxes as a rental for the past few years.

You also have to consider this inflated market that in many ares is getting ready to adjust down.Rates will more than likely balance out in or around 2024 but the lieklihood of 2% and 3% will be a thing of the past for awhile. 

It's a compelling statement to say HEY i'll give you $2,000 IN ADDITION to clearing your past due balance of $5,000.

Can you also tell me how to get a hold of the owners mortgage balance along with if there are more than 1 mortgage on a property? 

The alternative could be pull out the bill and see what it says or call the utility company with the bill in hand to see the balance due.  

If you are operating as a sole proprietor, the winning party could come after your personal assets for the balance.

I think the better high-leverage strategy, would be to get a loan on part of the 401K balance to acquire under-priced properties. 

I have 3-4 of my properties with HELOCs in first position; any cash I have available goes to pay down the balances, and whenever I need money for a repair or a new purchase, I draw on the HELOCs.

Liquidity on the balance sheet will help you grow your business.