Everyone is going to be able to goggle the address as see what HUD had the property listed for and with a little investigation can find out approximately how much you bid for the property(Prior to closing)  For example, a property is on the market for $100,000 and you get it under contract for $80000 or so you could illustrate value by wholesaling it for $90000 and an investor might perceive that as a value

We need additional 50k to Finnish house and estimate conservatively it will be worth 350k, I think it will be closer to 420k.

I received an estimate to make room for a hot tub that does NOT include the cost of a hot tub.

I'm also interested in understanding how you arrive at these estimates.

Building Cost: - I've heard varying estimates $/ft for capex related to building a climate control facility, but what can I expect generally in total $/ft for an assumption when building 150 or 250 unit building.

The first way is build a team large enough to do it all in house, now you have a crew lead who can go estimate time and materials to get jobs done. 

I’ve already got contractors I can use which is where I get my build estimate.

Credit karma gave me a score of 711, I know it is an estimate but I found it weird one had a score yet the lender got none.

I understand Zillow gives estimates and is not always accurate, however,  I've confirmed numbers through the county Appraiser website.

As a contractor, you want to include an estimated completion date.