Bought with long term intent, but things changed...

[Jon Klaus]

I bought a single tenant commercial building in June of 2015.  I planned to hold long term.  The month to month tenant just moved out last month, so I've been marketing to find another tenant and have some good possibilities.  

I just received an unsolicited offer to sell the building.  I'm thinking of negotiating the sale.  It will probably be less than a one year hold if I'm successful.   Can the transaction qualify for a 1031 exchange?  Or long term capital gains tax treatment, given the original intent?