I’ve used @Yonah Weiss and his firm gave me a high level estimated Cost Segregation to see tax savings before we spent a dime.

I really got to know the industry on a personal level and 2 of my flips were from clients.

Yes, it was added sometimes, but your statements are extraordinarily misleading and hysteria-producing.Extremely low levels that appear simply because a material is naturally sourced haven't ever been show to be a particular danger. 

Rock climbing gym project derailed because planners want sidewalk ramp up to building for wheelchair accessibility form street level on elevated site, Bend OR.

Assembly is pretty straightforward, It took me longer to prepare/level the base than to assemble the shed.

High level market research has been completed and I have narrowed to about 20 zip codes in my area, which is still a lot... 

This is a single family home that either has a walk out basement or a split level house.

You could take it to the next level and assign a value to the land improvements and buildings as well. 

It all depends on your level of experience, whether your agent or boots on the ground have seen it and sent you video, how good the photos are at getting everything if it's a wholesale deal, and your risk tolerance.

I suspect the crack would eventually telegraph.Those Ikea patio tiles would be a whole lot less risky than real tile and cheaper if you could get it level.