There are other ways to access this without getting your license.Knowledge of RE in studying to get your license?

With gates on both side to give direct access to to the open field/park behind the duplex.

For example, that no more than 25% of the existing SFR may be demolished/altered to make way for say an access driveway easement for the new rear flag lot.

I would assume that agents in your area have access to that data on their MLS.

Also, providing internet access is also a sticky subject, if you had access could be a violation of their privacy. 

Also, interest rates are very low now, so it would be nice to have access to that money.

Then, you just continue the process of using the HELOC like savings and checking etc...Most primary First Lien HELOCs will give you up to 90% LTV on the appraised value of the house, too, so you'd have access to more cash.

Our goal is to move out and buy a single family home and rent out the apartment with access to the basement.

., but if you align yourself with a reputable, successful operator in that local market you can gain access to some great deals you otherwise wouldn’t have had access to.Sponsor Diversification - Vet sponsors carefully and don’t stay married to one sponsor forever.

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.