When the cost was super low compared to the potential cash flow.

Hard to say right off the bat which is a better option since it depends a lot on what you are looking for and your situation but speaking with a lender that understands the application of primary residence loans in multifamily will be important to help you find the right option.

This heightened competition can drive home prices up, potentially offsetting any savings gained from lower rates.Let me know if youd like me to crunch some numbers

This kind of established business relationship exists for three months after the inquiry or application.

@Alexander Robert Wondoloski I think you'd find this book very helpful for evaluating potential properties.https://store.biggerpockets.com/products/real-estate-by-the-...

When deciding whether to sell the rental property or buy out your partners, consider factors such as the current market value of the property, any outstanding mortgage or debts on the property, the potential for appreciation in the future, and the rental income generated by the property.Calculate the amount you would need to buy out your partners and compare it to the potential profit you could make by selling the property.

Your cellar appears to have potential based on its features like full-size windows and a separate entrance.You're on the right track!

And talk to 5 recommended experienced property managers that will give you honest feedback on what homes will rent for in specific areas, potential problems, tenant base, etc.  

Open a new application with an actual lender that isn't going to charge 12k in origination fees. 4.5% origination on this deal is insane, the broker / lender are ripping you.If you take this to another lender as is (not great credit, no experience, light rehab amount) you would likely get denied again. 

If you used that $100k to buy with hard money, you could find a value add deal and potentially move into a higher priced property or even a duplex.