If the house is that good of a deal, I would rather pay $150 and have the seller remove the tank and show a clean soil test before you take ownership.

I want an ownership stake in the property and have the money to pay closing costs and about 10% of the investors down payment.  

In that the goal is to find someone with a lot of equity, or full ownership and pay them monthly until you be ome the full owner. 

I am currently working on making sure that the home will be able to get permits once the buyer takes ownership.

Also, if your market lot rent  is 300 and you know you can increase lot rents, then you might take a low DSCR day 1 but it can be increased shortly after taking ownership. 

They can get a "charging order" againts my ownership interest in the LLC since I own the interest in the LLC but those are really hard to collect, as they can only take what you pull out of the LLC.  

It's certainly much cleaner to not have to change the ownership structure on the deed 10 minutes after you buy it.  

Investor offers $67k for 50% ownership in the property.

Many times, tenants will assume ownership of a property after a period of time.

A Trustee holds title.2) Interests are apportioned amongst the various parties you mention.3) Due on Sale negotiations with lender take place.4) Ownership interests are shifted according to who's paying whom and in what amount and when.Be careful of gifting and lease option elements.