Hey Guys, I will be breaking down my deal in Sioux Falls, SD that I am currently under contract for and would love some advice/opinions while I am in my due diligence period. 

I think that this going to be a great refinance that will get you better cash flow, or speed up the repayment period. 

If the tanks leaked, remediation and cleanup will have to be done, and the property readings will have to be under maximum allowable percentages of contaminates for a certain period of time before the property can be re utilized.As to the asking price, either the seller doesn’t really want to sell, the seller wants to see if he can find a sucker; or possibly the value of the land for future development is much more valuable than the existing use.But assuming that the latter is not the case, what is it that attracts you to a deal priced over twice market value with a possible environmental problem to boot?

Here's an example:If your goal is to purchase a buy and hold rental and manage it for a period of at least 5 years, then odds are you'd want to do all the stuff folks above are talking about: join a REIA, research the market, learn about land lording best practices,learn the land lord/tenant laws of the state in which you will invest. 

Every pipe / joint pretty much  was frozen and burst in that period from Feb through June 2016.  

A few months ago I read a few of the BiggerPocket books, listened to many podcasts, and even started to obsess about buying a mobile home park but now with the pregnancy I fell back into “safe zone” mentality of buying a primary residence and making smaller moves.

So if the original contract does not mention an inspection period, you'll have to accept it as written unless an amendment is signed. 

Clearly I want their things out of the house but it appears they are trying to hold me hostage and use the property for storage for an indefinite period of time.

Since we will not have the time to actively pursue real estate investments  during this period, what are tips on staying engaged in the market and ready to roll once he returns home?

I typically use a 15 Business day inspection period and "This Contract is contingent upon Buyer's partners' inspection and approval at the sole discretion of Buyer's partners any time before the inspection period ends.