Hopefully you know some local fellow investors, but if not, certainly developing this local network is important and would put an emphasis on that as well.   

Allows globalized companies to accept a more neutral currency.

While your value added is in the physical aspect of real estate (building SFR, developing subdivisions, etc) our emphasis is on deal structuring (loan modification, wrap mortgages, interest rate arbitration, real property consolidation, tenant repositioning, etc.). 

https://propertygrid.com/Someone told me about it and it uses blockchain technology and tokenization of ownership with the purported goal of enhancing the real estate transaction and opening up global markets.

From page 730 (emphasis mine): "All non-business tax deductions and exemptions that were temporarily suspended by the 2017 tax bill should be permanently repealed, including the bicyclecommuting expense exclusion, non-military moving expense deductions, and the miscellaneous itemized deductions.23 The individual state and local tax deduction, which was temporarily capped at $10,000, should be fully repealed.

Quote from @Arvand Sabetian: I think most others have already provided sound advice.I wanted to emphasis having a conversation with your tenants about the septic tank, not just a clause in the lease that you assume they'll read and understand.Many people are unaware of what they can be doing that causes issues to septic tanks (e.g., flushing the wrong items).Also, make sure you do a walkthrough yourself prior to filling the unit.

Even if you did entire build yourself, I think you are looking at 2.5 times your estimate and a lot of work and time.I suggest you go to some meet ups with an emphasis on understanding the value added by ADUs.  

Depending on the CU or Bank you should be able to obtain a full doc commercial loan if they property meets a DSCR ratio of 1.25 or better, Global Cashflow is 1.21 or better, and you have some residential experience. 

By placing more emphasis on the condition of residents’ dwellings, the new inspection model aligns more closely with stakeholder expectations regarding housing quality.

You should be placing far greater emphasis on the  fundamentals of the neighborhoods in which you invest.