You shouldn't even consider an out of state park unless there are at least 50 spaces and rent is a minimum $200/space.Based on the rents it sounds like Alabama, Mississippi or Louisiana..

At the minimum you will need some kind of chair lift as seniors will have a difficult time going up and down the stairs, but you may want to even consider an elevator. 

or i say "would you consider an all cash offer"Owner "no" Any advice/tips would be GREATLY appreciated!

If I can add value and increase it another 5-10% on top of that I would consider an excellent deal.Now just because you found a house discounted from the market doesn't mean its a great buy for a rental.

You might consider an S-Corp for your flipping, especially if these flips will be short term.  

I would consider an additional fee.

If it's smart, I would also consider an 80/10/10 scenario with a piggy-back loan to help mitigate having to pay PMI.Investment-wise, I think the smartest thing to do is get land and put a modular home on it.

As a seller, I require a letter of Pre-Approval for the sale price (even if that gets negotiated down) AND a Proof of Funds letter on institution letter head before I even consider an offer and that's my instructions to the broker. 

Couple things that come to mind are schedule a regular landscaping company to trim the lawn, make sure utilities are on but shut the water off at the meter just in case there is an interior water break the property wont be damaged, make sure your insurance covers a vacant property and or a vacant property undergoing construction, if its in a bad area you may want to consider an alarm system (i use simply safe because you can install it yourself and use it on other properties as needed) leave some exterior and interior lights on and finally have someone go and check on the property once in a while if its going to be sitting.

Insurance would cover it, I would pay the deductible, and no assets would be lost.If you are in an area like San Diego where people are more likely to sue, a judge is more likely to find you guilty, and the payout is likely to be higher, then you may consider an umbrella insurance policy.