It's worth consulting a local attorney or using a reliable legal service to ensure it complies with state and local laws.

Focus on finding properties with immediate positive cash flow, conduct thorough due diligence and assemble a reliable team of professionals.

I recently put together two detailed excel profit/cash flow calculators specifically for BRRRR and fix-and-flip investment projects.

Ag Land leasing is only worth $10-50/acre per year, so 6 acres would only generate $300 max per year.  

Purchase price: $390,000 Cash invested: $150,000 Rezoned to allow for ADU and am currently finalizing plans to add a second story and redevelop the 3-car detached garage into an medium term rental with an ADU above the garage.

Once coded you can do the forecast and do the analysis and see if it is worth keeping the property. 

It is an IRS approved federal income tax tool that increases near term cash flow by utilizing shorter recovery periods for depreciation to accelerate return on investment.

There are ways to conduct a one-time restoration of benefits, or to restore benefits, but those require you to refinance the existing mortgage into a conventional loan, or no longer own the home, so they probably aren't worth it with your current scenario. 

Property must be worth at least $75k

Here's a guide that describes what good cash flow looks like and how to analyze a property.https://www.biggerpockets.com/blog/rental-property-cash-flow...