Vacation Home - Cap Gains after less than a year of Ownership?

[Jill Rankin Vega]

We purchased a recently flipped cottage in June 2017 for the intended use of renting it out as a vacation home as well as personal use. Well, someone whose family owned the cottage during their childhood has made us a substantial offer to purchase it back. In the short time we've owned it, it's only been "rented" to family and friends for cash. Nothing official on the books per se. My question is what are the tax implications of selling? Do we qualify for a 1031 exchange? Does it even need to qualify as a 1031 exchange since it's a second home? Or have we not owned it long enough? We do have every intention of reinvesting the funds should we sell.