To give you an example, we walked every 5th unit at an 800 unit property, but only took notes on paper and used excel to track and estimate costs.

Only one obstacle is big weeping willow.Whats a good way to estimate my site prep costs?

Even if I was told the subdivision an estimate would be inaccurate since some floor plans are more popular than others. 

The population estimates of these cities are 17,751 and 20,484 with both cities showing a -4.8% growth rate (2010-2019), meaning less people than roughly a decade ago.

PM if you want their numbers for estimates.

Here in Michigan, the assessed value is 50% of market value.If something similar applies to this property, $90k assessed value would imply an estimate market value of $180k...

Also, what are the estimated market value and the intended cash-out amount?

I was wonder how to estimate tear down and rebuilt of house.That way I can give my offer to seller. 

If you are concerned about material choice get an estimate from your roofers that lists out the exact materials they are using and then if you want to question them or ask them to change materials you can do that. 

We even had a mason look at it (brick building) who already gave me an estimate on how much some necessary brick work will cost.It is a mixed use, commercial on bottom, and apartments on the 2nd and 3rd level.