I am thinking that this house is probably going to make a good rental for someone but how do I advertise it, should I offer the seller less for the unfortunate view?

Your average buyer is not informed enough on the cost benefit tradeoffs of these technologies to be able to perform a thorough analysis of the improvement, and so they won't perform it, and therefore the demand simply does not exist.  

If the seller don't like your offer you just continue to the next.

Can a seller cancel a 30 day contract one day after signing claiming that you didn’t tell them you were a wholesaler and you let them know that you are real estate investor

The seller is replacing the roof prior to closing.

The exception might be, like you say, a high demand area with high rents. 

Thanks Ask the seller to carry the note (owner financing) for a short period of time while you find other permanent financing.

couple items.. this is far too much information to share or expect a response for free on any forumwhat you do is simply go sit down with a good civil engineer for an hour and pay them for it if need be they can tell you all this easily and work up a bid to handle it all.. this is all very easy stuff in the development world unless your soil is like gumbo or something. or its full of vegetation.I like open air storage as a concept personally.. as long as you have demand.. @?

The seller offered me 30% down and 6% interest when I inquired about seller financing.

I made an offer of 215000 with seller concessions.