My strategy is the following: I'm looking for the homeowner to deed the property over to me with no money, obtain durable power of attorney from the homeowner to speak to the bank on behalf of the homeowner and negotiate down the $343864.16. 

It was a filler in many building materials because of its low cost, durability and heat resistance properties.

Vinyl wood is the most durable and easy to Reglue if it comes loose.

while I am not a fan of turn key, (no upside till appreciation occurs) be sure to pick an area with good rent to value, as well as durability of rents, if you are in Chicago, consider Milwaukee and surrounding, Brew City REI on Facebook is a great group, with lots of Property managers and contractors, you need to learn the neighborhoods though.

My properties are c - class; I am updating some of my units and wondering what is a better choice for durability.

I'm obviously not trying to deck a place out in the nicest finishes, etc. but putting in durable materials that'll last through several renters would be ideal. 

And I went with durable materials for long-term. 

Quality encompasses not just how fancy the hardwood floor or appliances are, it gets into the durability of the finishes, the craftsmanship, the attention to detail of the design, and many other factors that are essential to your ownership experience (the stuff behind the walls).  

I see different things about wether   building materials are an expense, or just the sales tax on the materials with depreciation of durable components. ?  

A few things I can think of at the top of my head is to:1) Add leasing fee for additional occupants;2) Offer landscaping services for a fee;3) Allow for pets and charge pet rent (as long as you have durable materials in home to avoid faster wear and tear);4) Update hardware in kitchen;5) Change old light fixtures - make sure you have good light in the home;6) Update doorknobs;7) Repaint front door; and8) Add outlets with USB ports.I have heard some people mentioning that adding a smart thermostat can help increase rents - anyone have first hand experience?