It is my intention to continue to use it for STR and it should pay for the entire mortgage. 

Since the buyer has equitable, but not legal title, the seller can have additional liens placed on the property, either intentionally or unintentionally, and although legally obligated to have those liens removed he may not have the means or incentive to do so.The buyer is relying on the seller to transfer title at some future point in time.

Now if you bought your home as a house hack, or with the intention to make a profit, I guess that would qualify you as well. 

Therefore, you will likely have to make the intent of the person who is giving you the gift has no intent of seeking repayment.  

I started with the same intention  that I would start small with single families and then grow into multifamily! 

I don't mean sending the tenant a reminder and receiving from them a promise from the heart, a notarized affidavit of intent, a blood oath on their children's eyes that yes, they will be out on such-and-such a date and time.

It’s a single family 4 bed home with the intent to rent out the additional rooms.

The one I will be renting is $750,  I intent to continue to pay that rent and count it towards cash flow.

I buy multi family apartment buildings with the intent of getting FORCED APPRECIATION to get cashflow up and make me sell the building for a good profit a few years down the road.Just like this property - which I sold and made over $1 MILLION profit on.

I purchased a 2 bed/2 bath condo in my area with the intent to live in it for a bit before ultimately renting it out as my first investment property.