From the lender's perspective, yes they are.

I appreciate your perspective.  

I would make sure you have a good team ready to go and be ready to pounce whenever the opportunity presents itself.From the lenders perspective, it can be kind of tricky because there are plenty of properties that cash flow well, but even fully-rehabbed they are less than 100k, which make them difficult to lend on.

Additionally, from the PMs perspective, why would you turn away an owner who is willing to improve their asset that you manage? 

That right there will set someone apart in the Detroit market, sadly.I can't speak to his PM business from a firsthand perspective as I've never had him manage any of my properties (I still self-manage). 

I've found that what I value most in regards to real estate investing are the people who know about actual home repair and can approach a sale from that perspective.

However, I think it’s good you said your point of view because any perspective to try to do the right thing is a great thing, and all of us are stewards of REI at large and have a responsibility to present it in the most professional and ethical manner.

This perspective is solely from years of experience managing mobile home park funds and working with the tax experts around us.All the best,Jack

That said, I do want to respectfully offer some counterpoints to Dan's assessment that may provide a broader perspective on the value and feasibility of ADUs.1-2.

I'm not experienced (yet) on the real estate side of tax accounting, but from a business perspective I can safely say that a good accountant that will give the best advice is not going to be the cheapest one.