So I have a few options. 1-Back out of the deal and start looking for a new deal.2- Change the closing date.3- Or make a creative counter offer.

Long story short I asked him what he was willing to take for his property and he hit me with 340k.Its likely him and I will not come to a deal but what are some different strategies I can counter offer this guy to get him on my side and hopefully have a win win outcome?

Im also on a deadline for counter offering. 

And how time sensitive is it if it takes half a year to even get a response or a counter offer back?

I have been apart of/acted as broker for ownership groups that have so much tension and lack of communication, that by the time everyone can agree on a given issue (say...agreeing on the extent of buildout they are willing to counter-offer a prospective tenant who has submitted an offer to lease)...that tenant has usually moved on, leaving their space vacant for additional time.This can all be avoided very easily, but when lines of communication weaken...the bottom line usually follows suit.  

If they haven't received a single offer that should tell them that they are poorly priced and I would expect that at the very least you should be getting a counter offer.

I make a counter offer and do the repairs myslf.

Need to find funding by Monday or Tuesday because the counter offer went back to the seller on Friday. 

The worst thing they can do is say no but hopefully they will say yes or make you a counter offer and the negotiations can begin. 

If the realtor won't do it, get another realtor, he works for you :)The seller may be offended, they may counter offer (sometimes with the asking price), they may ignore it, but they may take it.