Princeton Real Estate Summary for December 2015 January 15, 2016 by Josh Wilton Click Here for a real estate summary for Princeton New Jersey during the month of December. In December there were 32 Sold Listings. The average Sold Price in Princeton was $1,001,594. Houses were on the market for an average of 82 days. For more information contact Weichert Princeton at (609) 921-1900.