Ability to pay, do they pay, have they saved?

To make matters worse, in order to maintain access to the private FB group after 90 days, you have to pay an additional $450+ per month (yes, you read that right).

I could just sell it and do a 1031 to avoid capital gainsBut it is not so simple to just "sell it" I have a solid tenant and they are paying $3.6k/month, haven't missed a single payment and they are so sweet.

Here are some differences between the two to consider: HELOC: It's a flexible, revolving line of credit, allowing you to borrow as needed and pay interest only on the amount you use. 

How much will they pay in rent?

If you're in an area with high demand on contractors you'll probably pay a higher per sf price than in some other parts of the country for a new build. 

Using Facebook lead forms can streamline information collection.Door-to-Door Sticky-Note DeliveryI hired a woman to deliver my sticky notes, paying per piece delivered and offering a nice bonus for every home I purchased from the sticky notes.

Here in Florida, our most common contract states:"Buyer will pay cash for the purchase of the Property at Closing.

They are offering a syndication fund for section 8 housing paying 9% dividends and 60% annual profit sharing of cash flowing properties in the portfolio. 

Rent is so crazy here young professionals are willing to pay 800 a month for a bedroom with shared bath.