Second, narrow down properties that interest you before the sale, drive them preferably and go to the county assesment office to look up any mortgages or liens.

Can I have the Seller change the sales price to 600k? 

And if I am willing to move on, you are shrinking your pool of buyers and effecting your sale price.

On the KS side of Kansas City, the foreclosure laws for WY and JO counties ensure clear tax burdens prior to any sales. 

I have been an active commercial broker in NYC with over 60M in sales and I'm also trying to invest throughout the Tri-State area.  

You're basing the market value on recent sales of similar houses right?

After the sale YOU own the house, not the seller. 

6) How often are interest payments wrapped into balloon so there are no out of pocket charges to borrower during construction/market for sale of property?

https://www.har.com/content/newsroom/Highlights: Single-family home sales rose 5.3 percent year-over-year, with 5,260 units sold;Days on Market (DOM) for single-family homes decreased slightly from 67 days in February 2017 to 65 days this February;Total property sales increased 3.1 percent with 6,375 units sold;Total dollar volume climbed 4.5 percent to $1.7 billion;The single-family home median price rose 1.4 percent to $226,200, which represents a February high;The single-family home average price edged up 0.4 percent to a February high of $281,945;Single-family homes months of inventory shrank year-over-year from a 3.4-months supply to 3.2 months;Townhome/condominium sales fell 5.1 percent, with the average price up 2.0 percent to $210,887 and the median price up 4.6 percent to $170,000;Leases of single-family homes fell 11.5 percent with the average rent up 4.1 percent to $1,720;Volume of townhome/condominium leases dropped 11.5 percent with average rent up 2.2 percent to $1,515.

Many states the rate is higher than CA .What are the comps , recent sale prices of similar properties ?