Nope it's common to want to close before years end.
Is the seller doing a 1031 exchange??
If the end of the year comes and goes and the tax urgency goes away the seller might up their price or decide to not sell anymore all together.
Is this property under contract and you have conducted due diligence and are getting close to closing OR are you just talking to the seller about putting in an offer??
Unless you have all cash and are waiving any inspections it would be impossible. Even then it's not likely. Most title, attorney, inspection people are taking off now until the new year. They are pushing to close out deals 90% finished before years end. Anything new is pushed to next year.
Did you ask the seller? Just curious since no one here has any idea, but could only speculate on the conversation you had with the seller. There could be an endless number of scenarios as to why the sellers wants a 2014 close but the only way to know for sure is to ask.