Im not familiar with home union but saw a really detailed post on Roofstock. 

Generally, they are very detail oriented and will inspect things you would never think to look at as a new investor.Additionally, a sewer line inspection is a life saver.

Cash Flow Quadrant is a good book at explaining these concepts in more detail without getting too heavy into the numbers. 

My question is does anyone know how to go about estimating the costs to remove the contamination?

Find out the details from him and from the police.

And by high end, I mean rehab money spent on architectural details that are in keeping with the historic charm of the surrounding neighborhood. 

I'm with @Mike Wood in regards to your estimates.

They have given me fair quotes in the past.Private message for details.

What tax estimate on cash and mortgage/HELOC boots?

HelloIf I am looking into putting a property under contract but I am not in the state to be able to physically inspect the house how would I be able to otherwise properly estimate repair cost to do my own numbers research before actually buying and/or selling?