Landlord-tenant laws vary widely from state-to-state so only a local attorney could advise you conclusively. 

I am in the Scottsdale area but looking to invest in single family rentals pretty much valley-wide as well.

I have even purchased the same product for widely varying prices from different vendors and it's worth it to me *as long as I can make a profit*.

They usually have loans, parents, grandparents who they can go to if they need cash for rent.ROI is a wide open question and depends on how you buy.  

In addition, as to the cost of construction, it varies widely, depending on the style of the building, materials being used, finishes, etc. 

I would recommend that the Attorney must be: In the state where you are planning on Wholesaling.A litigating attorney.Experienced with the agent’s/broker’s regulatory board for your state.Familiar with Wholesaling, if you are explaining it to them, they are the wrong attorney.If they are also a licensed broker, that is helpful but not mandatory.You will spend $125 to $1,000 for their advice and it will be the best money you’ve ever spent.Emotions and conjecture on the topic of wholesaling vary widely.

The assessment ratio varies widely by state.

As economists will point out, when you give buyers and sellers access to critical information about pricing that was not available beforehand the wide margins at which savvy buyers were able to take advantage of less educated sellers begin to tighten up.  

(A) need to accumulate more capital/equity somehow or(B) need to lower your monthly nut or(C) take on more risk to achieve higher returnsThe actual numbers vary widely based on market, types of leverage used, and how you operate... but the equation stays the same.

Each state seems to vary widely.