You never know until you try. My suggestion would be to write a very clean offer, and show that the cash is immediately available, and offer a fast closing. Should you want assistance with this, I am available on Saturday.
If the seller needs a higher sale price are you able to get a small mortgage from a credit union? You may even be able to find a seller to hold a small mortgage since you would be putting most of the money down.
If you're working with a Realtor, he/she can help you figure out what the property is worth. Who knows it may not even be worth $275k. Some Sellers are overpricing their properties in this "seller's" market and in some cases they are absurdly overpriced.
All the best,
Alma Rose Kee, PA
Future Home Realty
As suggested by the agent in FL, make sure that you are accurately conveying your offer; that this a cash offer, the details of your offer and I agree on offering to close as quickly as possible. This typically gets a sellers attention. Best of luck.