@Ramon Pena Alvarado in addition to what has already been shared above, here are a few more items to consider:Management - if the park is out of state and you choose to use a third party manager (be extremely careful and selective if you make this choice) that will add another layer of expense.  

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It is incredibly historic and you should be ashamed of yourself to trivialize it with the items you mentioned above.

There is something like a "line item" or "addendum" on the contract in which you specify a higher price that the assignee (end buyer) will pay.

You get info and updates on many items.

at month 10 I decide If Im going to put the excessive cash into the rehab, (minor items i would have already taken care of)

IIRC we turned the place within a month but did replace the carpet, but we raised the price by 1/2 the carpet cost.Generally pointing out what the seller already knows, and then offering to "eat" that item yourself is the least costly way to go.all cash

If they do go and read some of the latest minutes from board meetings, if possible, and see the items they are discussing.

I'm sure you will have to take into account the cost of conversion, but it seems like selling four condos might bring more money in then simply selling a fourplex.

By far the two biggest items are the kitchen and the bath.