I would be amazed, shocked even, if a traditional financial institution was willing to lend on a non-habitable asset up to 80%. 

It depends on your financial strength, the quality of the property, how many properties you own, etc.I like to start with one significant expense and three months of vacancy.

Prioritize your financial stability.

They won’t offer financial advice or specifics about what they think you should do but are there to answer questions and help you look at things from different perspectives.

@Jonathan Chan Here is a list of allowable assets for SDIRA investing. 

The floorplates and inefficient use of land (due to parking) make it difficult to create financially feasible and useful reuse projects. 

Your plan to house-hack and reinvest is solid stay focused on properties that align with your financial goals, and you’ll build a successful portfolio over time.

Your current RE seems like a fine asset that I would not consider selling to enter most other markets.  

That area in PA can also work for STR and MTR so if you buy a 4-unit, you have the option of diversifying the asset inside of itself by doing 2 LTR, 1 STR, and 1 MTR if you wanted to give yourself some options.

While both involve finding and properly securing a site and bringing it to full entitlement, the ground-up process includes the land piece but gets way more involved and complex to execute.The full "Monty" for ground-up development needs to include financial literacy, an explanation of metrics, and how they work.