I am a local agent and represented myself in the transaction.

If it was me...I'd check with zoning to find out how many dwelling units I could build, and I'd find what the requirements are for those units (type of house, height and setback restrictions, etc.).Then I'd find out what local builders think the cost to construct would be - just get a cost estimate per square foot for 2 or 3 different levels of finish.

That's why I think investors are not your friend, you want retail buyers.Have you talked to the neighbors on all sides of you? 

If it a zoom group, local group or "one on one".

Quote from @Kaushik Sarkar: Hi,IQuest has had a local office near Beltline/Tollway I'm thinking that is addison.

Identifying the right market can make a huge difference in the success of this strategy.Curious to hear...are you planning to manage the property yourself, or are you considering hiring someone local? 

I am currently looking for a small local bank or credit union that issues lines of credit collateralized with investment property.

Just keep the amount within any local rules and give proper notice.

Currently have 3 rentals and conventional lending has been my norm, but all the local lenders are predominantly 25% down. 

Connecting with local experts can also provide valuable insights to refine your strategy.Good luck!