Therefore, it is a waste to break it out.The only reason that you would need to break it out is if you brought a condo where each unit is a separate tax lot.

Currently, have a property that has been on the market for some time, spoke with the agent and the sellers are trying to move forth due to another property.

So I have no reservations about moving and renting it out. 

Where would you live if you moved there? 

My understanding is that assuming that one has no debt other than the mortgage for the first househack, it is calculated as(PITI1 + PITI2) / (Monthly Paycheck + 0.75*Rent1 + 0.75*Rent2)Rent1 is the total rent collected from the first property assuming that you have moved out and have fully rented it, and Rent2 is the rent collected from the other units in the new multi-family property that you want to buy.Is this correct?

During restretching, we may need to move some of the tenant’s furniture, though we will work around it if we can.

Treat each room as a separate apartment and have individual leases.  

But there is still a lot more risk baked in - a lot more moving pieces, a third party is involved, a lot more chances for things to go wrong compared to #3. 

Paint was a year old in great shape when she moved in and she was here less than a year.

I moved to Denver about a year ago and currently work remotely at a financial technology company building software for the Healthcare space.