Do the math at a 6% loan rate.There's a reason many apartment buildings have been converted to condos and sold.

At the refinance, I am able to get a loan for $180,000 and $20,000 of the money partner's money stays in the deal.

Always ask your agent to ask the listing agent which title company/closing attorney that they are working with.

Right now, the best offers around me are for some 1.3-4 million, that only generated around 100k per year gross, so there would be a high chance of not cash flowing, and paying money, especially with a commercial loan (these buildings have more than 4 units).I was thinking that although the rental itself does not generate money, I would be able to deduct the mortgage interest, and depreciation from my personal w2 income and would be net positive.

This vary heavily town to town. 20% down is great if buying strictly as investment but if you have a way of owner occupying I would explore that route and apply the 20% down to increasing value of property and instead using low money down loan. 

Here is what the IRS says on the subject: Election for Husband and Wife Unincorporated Businesses A business owned and operated by the spouses through a limited liability company does not qualify for the election Only businesses that are owned and operated by spouses as co-owners (and not in the name of a state law entity) qualify for the election.

The most important thing is to ensure your loan is covered in the event of a loss.  

., Purchase Price: $475,000 ($197.9/sq. ft.).Estimated Market Value: $402,000 ($168/sq. ft.).Financing Terms: 2% interest rate, with a 9-year balloon.Unit B Income: $2,049/month (Section 8 tenant through November 2025).Unit A Income Potential: Similar rent or higher; Section 8 cap for the area is $3,234/month.Monthly Loan Payment (P+I): $1,386.Cash Flow Breakdown (if both units are rented at $2,049/month):Gross Rent: $4,098/month.Vacancy (10%): $410/month.Operating Expenses (37.3%): $1,376/month.Net Cash Flow: $943/month.Key QuestionsWould you be comfortable paying an 18% premium for financing at 2%, especially in a market where current mortgage rates are closer to 7%?

Quote from @Jarrod Ochsenbein: I purchased an existing Padsplit with a DSCR loan. 

Hi @Frank Pyle,**I am not affiliated with any of the companies mentioned**To secure long-term financing for your Airbnb, look for DSCR lenders that accept pro forma income instead of requiring 12 months of rental history.