When you go from a single family to a Duplex, it becomes "comercial" property and according to (Michigan) the local building dept, I had to hire contractors. 

Costs vary but can range from $1,000 – $3,000 per unit.Water/Sewer: This is more complex and may require approval from your local water authority.

I am also open to connecting with local professionals for coffee meetings or informational interviews.Thank you for welcoming me into this community, and I look forward to learning and growing with your support!

What’s required for success in this is deep knowledge of real estate in general and the area in particular; experience in real estate and the local laws, etc.; and capital to pay for options, marketing, legal counsel, accounting, tax advise, etc.  

I would recommend looking for local FB investor groups, most areas have them!

I have tried local governments sites with little luck. 

Many months of costly vacancy, local market rent & resale deteriation, special assessments, property taxes and maintanance fees suggest a quick sale would have been the wise thing to do 2 years ago.

As a General Contractor myself here in east central Texas, I can tell you that connecting with local GCs via Facebook groups can be incredibly helpful.

I found the key is to go into one of the local Secretary of States offices. 

I am leaning on local first for my next investment, but not ruling out an out-of-market opportunity.