Hillsborough's price per sq. ft. has increased by $200 per foot since 2010, on its way towards $900 per foot and beyond for 2015. The average price per sq. ft. in Hillsborough real estate for 2010 was $679 per foot. With 2014 nearly in the books, the current price per sq. ft. for closed sales in Hillsborough is $879 per sq. ft. While Hillsborough's price per sq. ft. may not be as remarkably robust as neighbors such as Palo Alto ($1500+) or Atherton ($1200+), this important metric is on the rise and should steer wise luxury buyers to this great spot to invest.